ch3u_rma_sync.c 69.9 KB
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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
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/*
 *  (C) 2001 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */

#include "mpidimpl.h"
#include "mpidrma.h"

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/* Notes for memory barriers in RMA synchronizations

   When SHM is allocated for RMA window, we need to add memory berriers at proper
   places in RMA synchronization routines to guarantee the ordering of read/write
   operations, so that any operations after synchronization calls will see the
   correct data.

   There are four kinds of operations involved in the following explanation:

   1. Local loads/stores: any operations happening outside RMA epoch and accessing
      each process's own window memory.

   2. SHM operations: any operations happening inside RMA epoch. They may access
      any processes' window memory, which include direct loads/stores, and
      RMA operations that are internally implemented as direct loads/stores in
      MPI implementation.

   3. PROC_SYNC: synchronzations among processes by sending/recving messages.

   4. MEM_SYNC: a full memory barrier. It ensures the ordering of read/write
      operations on each process.

   (1) FENCE synchronization

              RANK 0                           RANK 1

       (local loads/stores)             (local loads/stores)

           WIN_FENCE {                    WIN_FENCE {
               MEM_SYNC                       MEM_SYNC
               PROC_SYNC -------------------- PROC_SYNC
               MEM_SYNC                       MEM_SYNC
           }                              }

        (SHM operations)                  (SHM operations)

           WIN_FENCE {                     WIN_FENCE {
               MEM_SYNC                        MEM_SYNC
               PROC_SYNC --------------------- PROC_SYNC
               MEM_SYNC                        MEM_SYNC
           }                               }

      (local loads/stores)              (local loads/stores)

       We need MEM_SYNC before and after PROC_SYNC for both starting WIN_FENCE
       and ending WIN_FENCE, to ensure the ordering between local loads/stores
       and PROC_SYNC in starting WIN_FENCE (and vice versa in ending WIN_FENCE),
       and the ordering between PROC_SYNC and SHM operations in starting WIN_FENCE
       (and vice versa for ending WIN_FENCE).

       In starting WIN_FENCE, the MEM_SYNC before PROC_SYNC essentially exposes
       previous local loads/stores to other processes; after PROC_SYNC, each
       process knows that everyone else already exposed their local loads/stores;
       the MEM_SYNC after PROC_SYNC ensures that my following SHM operations will
       happen after PROC_SYNC and will see the latest data on other processes.

       In ending WIN_FENCE, the MEM_SYNC before PROC_SYNC essentially exposes
       previous SHM operations to other processes; after PROC_SYNC, each process
       knows everyone else already exposed their SHM operations; the MEM_SYNC
       after PROC_SYNC ensures that my following local loads/stores will happen
       after PROC_SYNC and will see the latest data in my memory region.

   (2) POST-START-COMPLETE-WAIT synchronization

              RANK 0                           RANK 1

                                          (local loads/stores)

           WIN_START {                      WIN_POST {
                                                MEM_SYNC
               PROC_SYNC ---------------------- PROC_SYNC
               MEM_SYNC
           }                                }

         (SHM operations)

           WIN_COMPLETE {                  WIN_WAIT/TEST {
               MEM_SYNC
               PROC_SYNC --------------------- PROC_SYNC
                                               MEM_SYNC
           }                               }

                                          (local loads/stores)

       We need MEM_SYNC before PROC_SYNC for WIN_POST and WIN_COMPLETE, and
       MEM_SYNC after PROC_SYNC in WIN_START and WIN_WAIT/TEST, to ensure the
       ordering between local loads/stores and PROC_SYNC in WIN_POST (and
       vice versa in WIN_WAIT/TEST), and the ordering between PROC_SYNC and SHM
       operations in WIN_START (and vice versa in WIN_COMPLETE).

       In WIN_POST, the MEM_SYNC before PROC_SYNC essentially exposes previous
       local loads/stores to group of origin processes; after PROC_SYNC, origin
       processes knows all target processes already exposed their local
       loads/stores; in WIN_START, the MEM_SYNC after PROC_SYNC ensures that
       following SHM operations will happen after PROC_SYNC and will see the
       latest data on target processes.

       In WIN_COMPLETE, the MEM_SYNC before PROC_SYNC essentailly exposes previous
       SHM operations to group of target processes; after PROC_SYNC, target
       processes knows all origin process already exposed their SHM operations;
       in WIN_WAIT/TEST, the MEM_SYNC after PROC_SYNC ensures that following local
       loads/stores will happen after PROC_SYNC and will see the latest data in
       my memory region.

   (3) Passive target synchronization

              RANK 0                          RANK 1

                                        WIN_LOCK(target=1) {
                                            PROC_SYNC (lock granted)
                                            MEM_SYNC
                                        }

                                        (SHM operations)

                                        WIN_UNLOCK(target=1) {
                                            MEM_SYNC
                                            PROC_SYNC (lock released)
                                        }

         PROC_SYNC -------------------- PROC_SYNC

         WIN_LOCK (target=1) {
             PROC_SYNC (lock granted)
             MEM_SYNC
         }

         (SHM operations)

         WIN_UNLOCK (target=1) {
             MEM_SYNC
             PROC_SYNC (lock released)
         }

         PROC_SYNC -------------------- PROC_SYNC

                                        WIN_LOCK(target=1) {
                                            PROC_SYNC (lock granted)
                                            MEM_SYNC
                                        }

                                        (SHM operations)

                                        WIN_UNLOCK(target=1) {
                                            MEM_SYNC
                                            PROC_SYNC (lock released)
                                        }

         We need MEM_SYNC after PROC_SYNC in WIN_LOCK, and MEM_SYNC before
         PROC_SYNC in WIN_UNLOCK, to ensure the ordering between SHM operations
         and PROC_SYNC and vice versa.

         In WIN_LOCK, the MEM_SYNC after PROC_SYNC guarantees two things:
         (a) it guarantees that following SHM operations will happen after
         lock is granted; (b) it guarantees that following SHM operations
         will happen after any PROC_SYNC with target before WIN_LOCK is called,
         which means those SHM operations will see the latest data on target
         process.

         In WIN_UNLOCK, the MEM_SYNC before PROC_SYNC also guarantees two
         things: (a) it guarantees that SHM operations will happen before
         lock is released; (b) it guarantees that SHM operations will happen
         before any PROC_SYNC with target after WIN_UNLOCK is returned, which
         means following SHM operations on that target will see the latest data.

         WIN_LOCK_ALL/UNLOCK_ALL are same with WIN_LOCK/UNLOCK.

              RANK 0                          RANK 1

         WIN_LOCK_ALL

         (SHM operations)

         WIN_FLUSH(target=1) {
             MEM_SYNC
         }

         PROC_SYNC ------------------------PROC_SYNC

                                           WIN_LOCK(target=1) {
                                               PROC_SYNC (lock granted)
                                               MEM_SYNC
                                           }

                                           (SHM operations)

                                           WIN_UNLOCK(target=1) {
                                               MEM_SYNC
                                               PROC_SYNC (lock released)
                                           }

         WIN_UNLOCK_ALL

         We need MEM_SYNC in WIN_FLUSH to ensure the ordering between SHM
         operations and PROC_SYNC.

         The MEM_SYNC in WIN_FLUSH guarantees that all SHM operations before
         this WIN_FLUSH will happen before any PROC_SYNC with target after
         this WIN_FLUSH, which means SHM operations on target process after
         PROC_SYNC with origin will see the latest data.
*/

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MPIR_T_PVAR_DOUBLE_TIMER_DECL(RMA, rma_lockqueue_alloc);
MPIR_T_PVAR_DOUBLE_TIMER_DECL(RMA, rma_winlock_getlocallock);
MPIR_T_PVAR_DOUBLE_TIMER_DECL(RMA, rma_wincreate_allgather);

MPIR_T_PVAR_DOUBLE_TIMER_DECL(RMA, rma_rmaqueue_alloc);
MPIR_T_PVAR_DOUBLE_TIMER_DECL(RMA, rma_rmaqueue_set);

void MPIDI_CH3_RMA_Init_sync_pvars(void)
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{
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    /* rma_lockqueue_alloc */
    MPIR_T_PVAR_TIMER_REGISTER_STATIC(RMA,
                                      MPI_DOUBLE,
                                      rma_lockqueue_alloc,
                                      MPI_T_VERBOSITY_MPIDEV_DETAIL,
                                      MPI_T_BIND_NO_OBJECT,
                                      MPIR_T_PVAR_FLAG_READONLY,
                                      "RMA", "Allocate Lock Queue element (in seconds)");

    /* rma_winlock_getlocallock */
    MPIR_T_PVAR_TIMER_REGISTER_STATIC(RMA,
                                      MPI_DOUBLE,
                                      rma_winlock_getlocallock,
                                      MPI_T_VERBOSITY_MPIDEV_DETAIL,
                                      MPI_T_BIND_NO_OBJECT,
                                      MPIR_T_PVAR_FLAG_READONLY,
                                      "RMA", "WIN_LOCK:Get local lock (in seconds)");

    /* rma_wincreate_allgather */
    MPIR_T_PVAR_TIMER_REGISTER_STATIC(RMA,
                                      MPI_DOUBLE,
                                      rma_wincreate_allgather,
                                      MPI_T_VERBOSITY_MPIDEV_DETAIL,
                                      MPI_T_BIND_NO_OBJECT,
                                      MPIR_T_PVAR_FLAG_READONLY,
                                      "RMA", "WIN_CREATE:Allgather (in seconds)");

    /* rma_rmaqueue_alloc */
    MPIR_T_PVAR_TIMER_REGISTER_STATIC(RMA,
                                      MPI_DOUBLE,
                                      rma_rmaqueue_alloc,
                                      MPI_T_VERBOSITY_MPIDEV_DETAIL,
                                      MPI_T_BIND_NO_OBJECT,
                                      MPIR_T_PVAR_FLAG_READONLY,
                                      "RMA", "Allocate RMA Queue element (in seconds)");

    /* rma_rmaqueue_set */
    MPIR_T_PVAR_TIMER_REGISTER_STATIC(RMA,
                                      MPI_DOUBLE,
                                      rma_rmaqueue_set,
                                      MPI_T_VERBOSITY_MPIDEV_DETAIL,
                                      MPI_T_BIND_NO_OBJECT,
                                      MPIR_T_PVAR_FLAG_READONLY,
                                      "RMA", "Set fields in RMA Queue element (in seconds)");
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}
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/* These are used to use a common routine to complete lists of RMA
   operations with a single routine, while collecting data that
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   distinguishes between different synchronization modes.  This is not
   thread-safe; the best choice for thread-safety is to eliminate this
   ability to discriminate between the different types of RMA synchronization.
*/
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/*
 * These routines provide a default implementation of the MPI RMA operations
 * in terms of the low-level, two-sided channel operations.  A channel
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 * may override these functions, on a per-window basis, by overriding
 * the MPID functions in the RMAFns section of MPID_Win object.
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 */

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#define SYNC_POST_TAG 100

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/********************************************************************************/
/* Active Target synchronization (including WIN_FENCE, WIN_POST, WIN_START,     */
/* WIN_COMPLETE, WIN_WAIT, WIN_TEST)                                            */
/********************************************************************************/

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#undef FUNCNAME
#define FUNCNAME MPIDI_Win_fence
#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
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int MPIDI_Win_fence(int assert, MPID_Win * win_ptr)
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{
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    int i, made_progress = 0;
    int local_completed = 0, remote_completed = 0;
    MPIDI_RMA_Target_t *curr_target = NULL;
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    mpir_errflag_t errflag = MPIR_ERR_NONE;
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    int progress_engine_triggered = 0;
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    int mpi_errno = MPI_SUCCESS;
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    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_FENCE);

    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_FENCE);

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    MPIU_ERR_CHKANDJUMP((win_ptr->states.access_state != MPIDI_RMA_NONE &&
                         win_ptr->states.access_state != MPIDI_RMA_FENCE_ISSUED &&
                         win_ptr->states.access_state != MPIDI_RMA_FENCE_GRANTED) ||
                        win_ptr->states.exposure_state != MPIDI_RMA_NONE,
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                        mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");

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    /* Ensure ordering of load/store operations. */
    if (win_ptr->shm_allocated == TRUE) {
        OPA_read_write_barrier();
    }

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    if (assert & MPI_MODE_NOPRECEDE) {
        if (assert & MPI_MODE_NOSUCCEED) {
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            goto finish_fence;
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        }
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        else {
            /* It is possible that there is a IBARRIER in MPI_WIN_FENCE with
               MODE_NOPRECEDE not being completed, we let the progress engine
               to delete its request when it is completed. */
            if (win_ptr->fence_sync_req != MPI_REQUEST_NULL) {
                MPID_Request *req_ptr;
                MPID_Request_get_ptr(win_ptr->fence_sync_req, req_ptr);
                MPID_Request_release(req_ptr);
                win_ptr->fence_sync_req = MPI_REQUEST_NULL;
                win_ptr->states.access_state = MPIDI_RMA_NONE;
            }
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            if (win_ptr->shm_allocated == TRUE) {
                MPID_Comm *node_comm_ptr = win_ptr->comm_ptr->node_comm;
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                mpi_errno = MPIR_Barrier_impl(node_comm_ptr, &errflag);
                if (mpi_errno != MPI_SUCCESS) MPIU_ERR_POP(mpi_errno);
                MPIU_ERR_CHKANDJUMP(errflag, mpi_errno, MPI_ERR_OTHER, "**coll_fail");
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                /* Mark that we triggered the progress engine
                   in this function call. */
                progress_engine_triggered = 1;
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            }

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            mpi_errno = MPIR_Ibarrier_impl(win_ptr->comm_ptr, &(win_ptr->fence_sync_req));
            if (mpi_errno != MPI_SUCCESS) MPIU_ERR_POP(mpi_errno);
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            /* Set window access state properly. */
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            win_ptr->states.access_state = MPIDI_RMA_FENCE_ISSUED;
            num_active_issued_win++;
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            goto finish_fence;
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        }
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    }
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    if (win_ptr->states.access_state == MPIDI_RMA_FENCE_ISSUED) {
        while (win_ptr->states.access_state != MPIDI_RMA_FENCE_GRANTED) {
            mpi_errno = wait_progress_engine();
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            if (mpi_errno != MPI_SUCCESS)
                MPIU_ERR_POP(mpi_errno);
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            /* Mark that we triggered the progress engine
               in this function call. */
            progress_engine_triggered = 1;
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        }
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    }
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    /* Set sync_flag in target structs. */
    for (i = 0; i < win_ptr->num_slots; i++) {
        curr_target = win_ptr->slots[i].target_list;
        while (curr_target != NULL) {

            /* set sync_flag in sync struct */
            if (curr_target->sync.sync_flag < MPIDI_RMA_SYNC_FLUSH) {
                curr_target->sync.sync_flag = MPIDI_RMA_SYNC_FLUSH;
                curr_target->sync.have_remote_incomplete_ops = 0;
                curr_target->sync.outstanding_acks++;
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            }
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            curr_target = curr_target->next;
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        }
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    }
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    /* Issue out all operations. */
    mpi_errno = MPIDI_CH3I_RMA_Make_progress_win(win_ptr, &made_progress);
    if (mpi_errno != MPI_SUCCESS) MPIU_ERR_POP(mpi_errno);

    /* Wait for remote completion. */
    do {
        mpi_errno = MPIDI_CH3I_RMA_Cleanup_ops_win(win_ptr,
                                                   &local_completed,
                                                   &remote_completed);
        if (mpi_errno != MPI_SUCCESS) MPIU_ERR_POP(mpi_errno);
        if (!remote_completed) {
            mpi_errno = wait_progress_engine();
            if (mpi_errno != MPI_SUCCESS)
                MPIU_ERR_POP(mpi_errno);
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            /* Mark that we triggered the progress engine
               in this function call. */
            progress_engine_triggered = 1;
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        }
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    } while (!remote_completed);
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    /* Cleanup all targets on window. */
    mpi_errno = MPIDI_CH3I_RMA_Cleanup_targets_win(win_ptr);
    if (mpi_errno != MPI_SUCCESS) MPIU_ERR_POP(mpi_errno);
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    mpi_errno = MPIR_Barrier_impl(win_ptr->comm_ptr, &errflag);
    if (mpi_errno != MPI_SUCCESS) MPIU_ERR_POP(mpi_errno);
    MPIU_ERR_CHKANDJUMP(errflag, mpi_errno, MPI_ERR_OTHER, "**coll_fail");
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    /* Mark that we triggered the progress engine
       in this function call. */
    progress_engine_triggered = 1;

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    /* Set window access state properly. */
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    if (assert & MPI_MODE_NOSUCCEED) {
        win_ptr->states.access_state = MPIDI_RMA_NONE;
    }
    else {
        win_ptr->states.access_state = MPIDI_RMA_FENCE_GRANTED;
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    }

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 finish_fence:
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    /* Make sure that all targets are freed. */
    MPIU_Assert(win_ptr->non_empty_slots == 0);

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    if (assert & MPI_MODE_NOPRECEDE) {
        /* BEGINNING synchronization: the following counter should be zero. */
        MPIU_Assert(win_ptr->accumulated_ops_cnt == 0);
    }
    else {
        /* ENDING synchronization: correctly decrement the following counter. */
        win_ptr->accumulated_ops_cnt = 0;
    }

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    MPIU_Assert(win_ptr->active_req_cnt == 0);

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    if (!(assert & MPI_MODE_NOPRECEDE)) {
        if (!progress_engine_triggered) {
            /* In some cases (e.g. target is myself, or process on SHM),
               this function call does not go through the progress engine.
               Therefore, it is possible that this process never process
               events coming from other processes. This may cause deadlock in
               applications where the program execution on this process depends
               on the happening of events from other processes. Here we poke
               the progress engine once to avoid such issue.  */
            mpi_errno = poke_progress_engine();
            if (mpi_errno != MPI_SUCCESS)
                MPIU_ERR_POP(mpi_errno);
        }
    }

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    /* Ensure ordering of load/store operations. */
    if (win_ptr->shm_allocated == TRUE) {
        OPA_read_write_barrier();
    }

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  fn_exit:
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    MPIDI_RMA_FUNC_EXIT(MPID_STATE_MPIDI_WIN_FENCE);
    return mpi_errno;
    /* --BEGIN ERROR HANDLING-- */
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  fn_fail:
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    goto fn_exit;
    /* --END ERROR HANDLING-- */
}


#undef FUNCNAME
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#define FUNCNAME MPIDI_Win_post
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#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
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int MPIDI_Win_post(MPID_Group * post_grp_ptr, int assert, MPID_Win * win_ptr)
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{
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    int *post_ranks_in_win_grp;
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    int mpi_errno = MPI_SUCCESS;
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    MPIU_CHKLMEM_DECL(3);
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    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_POST);
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    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_POST);
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    /* Note that here we cannot distinguish if this exposure epoch is overlapped
       with an exposure epoch of FENCE (which is not allowed), since FENCE may be
       ended up with not unsetting the window state. We can only detect if this
       exposure epoch is overlapped with another exposure epoch of PSCW. */
    MPIU_ERR_CHKANDJUMP(win_ptr->states.exposure_state != MPIDI_RMA_NONE,
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                        mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
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    /* Ensure ordering of load/store operations. */
    if (win_ptr->shm_allocated == TRUE) {
        OPA_read_write_barrier();
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    }

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    /* Set window exposure state properly. */
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    win_ptr->states.exposure_state = MPIDI_RMA_PSCW_EXPO;

    win_ptr->at_completion_counter += post_grp_ptr->size;

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    if ((assert & MPI_MODE_NOCHECK) == 0) {
        MPI_Request *req;
        MPI_Status *status;
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        int i, post_grp_size, dst, rank;
        MPID_Comm *win_comm_ptr;
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        /* NOCHECK not specified. We need to notify the source
         * processes that Post has been called. */
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        post_grp_size = post_grp_ptr->size;
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        win_comm_ptr = win_ptr->comm_ptr;
        rank = win_ptr->comm_ptr->rank;
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        MPIU_CHKLMEM_MALLOC(post_ranks_in_win_grp, int *,
                            post_grp_size * sizeof(int), mpi_errno, "post_ranks_in_win_grp");
        mpi_errno = fill_ranks_in_win_grp(win_ptr, post_grp_ptr, post_ranks_in_win_grp);
        if (mpi_errno != MPI_SUCCESS) MPIU_ERR_POP(mpi_errno);

        MPIU_CHKLMEM_MALLOC(req, MPI_Request *, post_grp_size * sizeof(MPI_Request),
                            mpi_errno, "req");
        MPIU_CHKLMEM_MALLOC(status, MPI_Status *, post_grp_size * sizeof(MPI_Status),
                            mpi_errno, "status");
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        /* Send a 0-byte message to the source processes */
        for (i = 0; i < post_grp_size; i++) {
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            dst = post_ranks_in_win_grp[i];
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            if (dst != rank) {
                MPID_Request *req_ptr;
                mpi_errno = MPID_Isend(&i, 0, MPI_INT, dst, SYNC_POST_TAG, win_comm_ptr,
                                       MPID_CONTEXT_INTRA_PT2PT, &req_ptr);
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                if (mpi_errno != MPI_SUCCESS) MPIU_ERR_POP(mpi_errno);
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                req[i] = req_ptr->handle;
            }
            else {
                req[i] = MPI_REQUEST_NULL;
            }
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        }
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        mpi_errno = MPIR_Waitall_impl(post_grp_size, req, status);
        if (mpi_errno && mpi_errno != MPI_ERR_IN_STATUS)
            MPIU_ERR_POP(mpi_errno);

        /* --BEGIN ERROR HANDLING-- */
        if (mpi_errno == MPI_ERR_IN_STATUS) {
            for (i = 0; i < post_grp_size; i++) {
                if (status[i].MPI_ERROR != MPI_SUCCESS) {
                    mpi_errno = status[i].MPI_ERROR;
                    MPIU_ERR_POP(mpi_errno);
                }
            }
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        }
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        /* --END ERROR HANDLING-- */
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    }
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  fn_exit:
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    MPIU_CHKLMEM_FREEALL();
    MPIDI_RMA_FUNC_EXIT(MPID_STATE_MPIDI_WIN_POST);
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    return mpi_errno;
    /* --BEGIN ERROR HANDLING-- */
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  fn_fail:
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    goto fn_exit;
    /* --END ERROR HANDLING-- */
}

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#undef FUNCNAME
#define FUNCNAME MPIDI_Win_start
#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
int MPIDI_Win_start(MPID_Group * group_ptr, int assert, MPID_Win * win_ptr)
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{
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    int mpi_errno = MPI_SUCCESS;
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    MPIU_CHKLMEM_DECL(2);
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    MPIU_CHKPMEM_DECL(2);
    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_START);
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    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_START);
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    /* Note that here we cannot distinguish if this access epoch is overlapped
       with an access epoch of FENCE (which is not allowed), since FENCE may be
       ended up with not unsetting the window state. We can only detect if this
       access epoch is overlapped with another access epoch of PSCW or Passive
       Target. */
    MPIU_ERR_CHKANDJUMP(win_ptr->states.access_state != MPIDI_RMA_NONE &&
                        win_ptr->states.access_state != MPIDI_RMA_FENCE_ISSUED &&
                        win_ptr->states.access_state != MPIDI_RMA_FENCE_GRANTED,
                        mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
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    win_ptr->start_grp_size = group_ptr->size;
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    MPIU_CHKPMEM_MALLOC(win_ptr->start_ranks_in_win_grp, int *,
                        win_ptr->start_grp_size * sizeof(int),
                        mpi_errno, "win_ptr->start_ranks_in_win_grp");

    mpi_errno = fill_ranks_in_win_grp(win_ptr, group_ptr, win_ptr->start_ranks_in_win_grp);
    if (mpi_errno) MPIU_ERR_POP(mpi_errno);

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    if ((assert & MPI_MODE_NOCHECK) == 0) {
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597
        int i, intra_cnt;
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        MPI_Request *intra_start_req = NULL;
        MPI_Status *intra_start_status = NULL;
        MPID_Comm *comm_ptr = win_ptr->comm_ptr;
        int rank = comm_ptr->rank;

        /* wait for messages from local processes */
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        /* post IRECVs */
        MPIU_CHKPMEM_MALLOC(win_ptr->start_req, MPI_Request *,
                            win_ptr->start_grp_size * sizeof(MPI_Request),
                            mpi_errno, "win_ptr->start_req");
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        if (win_ptr->shm_allocated == TRUE) {
            int node_comm_size = comm_ptr->node_comm->local_size;
            MPIU_CHKLMEM_MALLOC(intra_start_req, MPI_Request *,
                                node_comm_size * sizeof(MPI_Request),
                                mpi_errno, "intra_start_req");
            MPIU_CHKLMEM_MALLOC(intra_start_status, MPI_Status *,
                                node_comm_size * sizeof(MPI_Status),
                                mpi_errno, "intra_start_status");
        }
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        intra_cnt = 0;
        for (i = 0; i < win_ptr->start_grp_size; i++) {
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            MPID_Request *req_ptr;
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            MPIDI_VC_t *orig_vc = NULL, *target_vc = NULL;
            int src = win_ptr->start_ranks_in_win_grp[i];
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            if (src != rank) {
                MPIDI_Comm_get_vc(comm_ptr, rank, &orig_vc);
                MPIDI_Comm_get_vc(comm_ptr, src, &target_vc);
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                mpi_errno = MPID_Irecv(NULL, 0, MPI_INT, src, SYNC_POST_TAG,
                                       comm_ptr, MPID_CONTEXT_INTRA_PT2PT, &req_ptr);
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                if (mpi_errno != MPI_SUCCESS) MPIU_ERR_POP(mpi_errno);
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                if (win_ptr->shm_allocated == TRUE &&
                    orig_vc->node_id == target_vc->node_id) {
                    intra_start_req[intra_cnt++] = req_ptr->handle;
                    win_ptr->start_req[i] = MPI_REQUEST_NULL;
                }
                else {
                    win_ptr->start_req[i] = req_ptr->handle;
                }
            }
            else {
                win_ptr->start_req[i] = MPI_REQUEST_NULL;
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            }
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        }
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        /* for targets on SHM, waiting until their IRECVs to be finished */
        if (intra_cnt) {
            mpi_errno = MPIR_Waitall_impl(intra_cnt, intra_start_req, intra_start_status);
            if (mpi_errno && mpi_errno != MPI_ERR_IN_STATUS)
                MPIU_ERR_POP(mpi_errno);
            /* --BEGIN ERROR HANDLING-- */
            if (mpi_errno == MPI_ERR_IN_STATUS) {
                for (i = 0; i < intra_cnt; i++) {
                    if (intra_start_status[i].MPI_ERROR != MPI_SUCCESS) {
                        mpi_errno = intra_start_status[i].MPI_ERROR;
                        MPIU_ERR_POP(mpi_errno);
                    }
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                }
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            }
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            /* --END ERROR HANDLING-- */
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        }
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    }

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 finish_start:
    /* Set window access state properly. */
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    win_ptr->states.access_state = MPIDI_RMA_PSCW_ISSUED;
    num_active_issued_win++;
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    /* BEGINNING synchronization: the following counter should be zero. */
    MPIU_Assert(win_ptr->accumulated_ops_cnt == 0);

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    MPIU_Assert(win_ptr->active_req_cnt == 0);
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    /* Ensure ordering of load/store operations. */
    if (win_ptr->shm_allocated == TRUE) {
        OPA_read_write_barrier();
    }

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 fn_exit:
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    MPIU_CHKLMEM_FREEALL();
    MPIDI_RMA_FUNC_EXIT(MPID_STATE_MPIDI_WIN_START);
    return mpi_errno;
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 fn_fail:
    MPIU_CHKPMEM_REAP();
    goto fn_exit;
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}


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#undef FUNCNAME
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#define FUNCNAME MPIDI_Win_complete
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#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
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int MPIDI_Win_complete(MPID_Win * win_ptr)
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{
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    int mpi_errno = MPI_SUCCESS;
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    int i, dst, rank = win_ptr->comm_ptr->rank;
    int local_completed = 0, remote_completed = 0;
    MPID_Comm *win_comm_ptr = win_ptr->comm_ptr;
    MPIDI_RMA_Target_t *curr_target;
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    int progress_engine_triggered = 0;
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    int made_progress;
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    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_COMPLETE);
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    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_COMPLETE);
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    /* Access epochs on the same window must be disjoint. */
    MPIU_ERR_CHKANDJUMP(win_ptr->states.access_state != MPIDI_RMA_PSCW_ISSUED &&
                        win_ptr->states.access_state != MPIDI_RMA_PSCW_GRANTED,
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                        mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");

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    /* Ensure ordering of load/store operations. */
    if (win_ptr->shm_allocated == TRUE) {
        OPA_read_write_barrier();
    }

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    if (win_ptr->states.access_state == MPIDI_RMA_PSCW_ISSUED) {
        while (win_ptr->states.access_state != MPIDI_RMA_PSCW_GRANTED) {
            mpi_errno = wait_progress_engine();
            if (mpi_errno != MPI_SUCCESS)
                MPIU_ERR_POP(mpi_errno);
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            /* Mark that we triggered the progress engine
               in this function call. */
            progress_engine_triggered = 1;
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        }
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    }

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    for (i = 0; i < win_ptr->start_grp_size; i++) {
        dst = win_ptr->start_ranks_in_win_grp[i];
        if (dst == rank) {
            win_ptr->at_completion_counter--;
            MPIU_Assert(win_ptr->at_completion_counter >= 0);
            continue;
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        }
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        if (win_comm_ptr->local_size <= win_ptr->num_slots)
            curr_target = win_ptr->slots[dst].target_list;
        else {
            curr_target = win_ptr->slots[dst % win_ptr->num_slots].target_list;
            while (curr_target != NULL && curr_target->target_rank != dst)
                curr_target = curr_target->next;
        }
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        if (curr_target != NULL) {
            /* set sync_flag in sync struct */
            if (curr_target->sync.sync_flag < MPIDI_RMA_SYNC_FLUSH) {
                curr_target->sync.sync_flag = MPIDI_RMA_SYNC_FLUSH;
                curr_target->sync.have_remote_incomplete_ops = 0;
                curr_target->sync.outstanding_acks++;
            }
            curr_target->win_complete_flag = 1;
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        }
        else {
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            /* FIXME: do we need to wait for remote completion? */
            mpi_errno = send_decr_at_cnt_msg(dst, win_ptr);
            if (mpi_errno != MPI_SUCCESS) MPIU_ERR_POP(mpi_errno);
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        }
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    }

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    /* issue out all operations */
    mpi_errno = MPIDI_CH3I_RMA_Make_progress_win(win_ptr, &made_progress);
    if (mpi_errno != MPI_SUCCESS) MPIU_ERR_POP(mpi_errno);

    /* wait until all slots are empty */
    do {
        mpi_errno = MPIDI_CH3I_RMA_Cleanup_ops_win(win_ptr, &local_completed,
                                                   &remote_completed);
        if (mpi_errno != MPI_SUCCESS) MPIU_ERR_POP(mpi_errno);
        if (!remote_completed) {
            mpi_errno = wait_progress_engine();
            if (mpi_errno != MPI_SUCCESS)
                MPIU_ERR_POP(mpi_errno);
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            /* Mark that we triggered the progress engine
               in this function call. */
            progress_engine_triggered = 1;
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        }
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    } while (!remote_completed);
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    /* Cleanup all targets on this window. */
    mpi_errno = MPIDI_CH3I_RMA_Cleanup_targets_win(win_ptr);
    if (mpi_errno != MPI_SUCCESS) MPIU_ERR_POP(mpi_errno);
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 finish_complete:
    /* Set window access state properly. */
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    win_ptr->states.access_state = MPIDI_RMA_NONE;
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    /* free start group stored in window */
    MPIU_Free(win_ptr->start_ranks_in_win_grp);
    win_ptr->start_ranks_in_win_grp = NULL;
    MPIU_Assert(win_ptr->start_req == NULL);
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    /* Make sure that all targets are freed. */
    MPIU_Assert(win_ptr->non_empty_slots == 0);

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    /* ENDING synchronization: correctly decrement the following counter. */
    win_ptr->accumulated_ops_cnt = 0;

802
    MPIU_Assert(win_ptr->active_req_cnt == 0);
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    if (!progress_engine_triggered) {
        /* In some cases (e.g. target is myself, or process on SHM),
           this function call does not go through the progress engine.
           Therefore, it is possible that this process never process
           events coming from other processes. This may cause deadlock in
           applications where the program execution on this process depends
           on the happening of events from other processes. Here we poke
           the progress engine once to avoid such issue.  */
        mpi_errno = poke_progress_engine();
        if (mpi_errno != MPI_SUCCESS)
            MPIU_ERR_POP(mpi_errno);
    }

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  fn_exit:
    MPIDI_RMA_FUNC_EXIT(MPID_STATE_MPIDI_WIN_COMPLETE);
819
    return mpi_errno;
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    /* --BEGIN ERROR HANDLING-- */
  fn_fail:
    goto fn_exit;
    /* --END ERROR HANDLING-- */
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}
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#undef FUNCNAME
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#define FUNCNAME MPIDI_Win_wait
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#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
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int MPIDI_Win_wait(MPID_Win * win_ptr)
833
{
834
    int progress_engine_triggered = 0;
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    int mpi_errno = MPI_SUCCESS;
    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_WAIT);

    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_WAIT);
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    MPIU_ERR_CHKANDJUMP(win_ptr->states.exposure_state != MPIDI_RMA_PSCW_EXPO,
841
                        mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
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843
    /* wait for all operations from other processes to finish */
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    while (win_ptr->at_completion_counter) {
        mpi_errno = wait_progress_engine();
        if (mpi_errno != MPI_SUCCESS)
            MPIU_ERR_POP(mpi_errno);
848 849 850 851

        /* Mark that we triggered the progress engine
           in this function call. */
        progress_engine_triggered = 1;
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    }

854 855
 finish_wait:
    /* Set window exposure state properly. */
856 857
    win_ptr->states.exposure_state = MPIDI_RMA_NONE;

858 859 860 861 862 863 864 865 866 867 868 869 870
    if (!progress_engine_triggered) {
        /* In some cases (e.g. target is myself, or process on SHM),
           this function call does not go through the progress engine.
           Therefore, it is possible that this process never process
           events coming from other processes. This may cause deadlock in
           applications where the program execution on this process depends
           on the happening of events from other processes. Here we poke
           the progress engine once to avoid such issue.  */
        mpi_errno = poke_progress_engine();
        if (mpi_errno != MPI_SUCCESS)
            MPIU_ERR_POP(mpi_errno);
    }

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    /* Ensure ordering of load/store operations. */
    if (win_ptr->shm_allocated == TRUE) {
        OPA_read_write_barrier();
    }

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  fn_exit:
    MPIDI_RMA_FUNC_EXIT(MPID_STATE_MPIDI_WIN_WAIT);
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    return mpi_errno;
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    /* --BEGIN ERROR HANDLING-- */
  fn_fail:
    goto fn_exit;
    /* --END ERROR HANDLING-- */
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}

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886
#undef FUNCNAME
887
#define FUNCNAME MPIDI_Win_test
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#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
890
int MPIDI_Win_test(MPID_Win * win_ptr, int *flag)
891 892
{
    int mpi_errno = MPI_SUCCESS;
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    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_TEST);
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895
    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_TEST);
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897
    MPIU_ERR_CHKANDJUMP(win_ptr->states.exposure_state != MPIDI_RMA_PSCW_EXPO,
898
                        mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
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    mpi_errno = MPID_Progress_test();
    if (mpi_errno != MPI_SUCCESS) {
902
	MPIU_ERR_POP(mpi_errno);
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    }

905 906
    *flag = (win_ptr->at_completion_counter) ? 0 : 1;
    if (*flag) {
907
        /* Set window exposure state properly. */
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        win_ptr->states.exposure_state = MPIDI_RMA_NONE;

910 911 912
        /* Ensure ordering of load/store operations. */
        if (win_ptr->shm_allocated == TRUE) {
            OPA_read_write_barrier();
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        }
    }

916
  fn_exit:
917
    MPIDI_RMA_FUNC_EXIT(MPID_STATE_MPIDI_WIN_TEST);
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    return mpi_errno;
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    /* --BEGIN ERROR HANDLING-- */
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  fn_fail:
921
    goto fn_exit;
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    /* --END ERROR HANDLING-- */
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}

925

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/********************************************************************************/
/* Passive Target synchronization (including WIN_LOCK, WIN_UNLOCK, WIN_FLUSH,   */
/* WIN_FLUSH_LOCAL, WIN_LOCK_ALL, WIN_UNLOCK_ALL, WIN_FLUSH_ALL,                */
/* WIN_FLUSH_LOCAL_ALL, WIN_SYNC)                                               */
/********************************************************************************/

932
#undef FUNCNAME
933
#define FUNCNAME MPIDI_Win_lock
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#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
936
int MPIDI_Win_lock(int lock_type, int dest, int assert, MPID_Win * win_ptr)
937
{
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    int made_progress = 0;
    int shm_target = FALSE;
    int rank = win_ptr->comm_ptr->rank;
    MPIDI_RMA_Target_t *target = NULL;
    MPIDI_VC_t *orig_vc = NULL, *target_vc = NULL;
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    int mpi_errno = MPI_SUCCESS;
944
    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_LOCK);
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946
    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_LOCK);
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    /* Note that here we cannot distinguish if this access epoch is overlapped
       with an access epoch of FENCE (which is not allowed), since FENCE may be
       ended up with not unsetting the window state. We can only detect if this
       access epoch is overlapped with another access epoch of PSCW or Passive
       Target. */
    if (win_ptr->lock_epoch_count == 0) {
        MPIU_ERR_CHKANDJUMP(win_ptr->states.access_state != MPIDI_RMA_NONE &&
                            win_ptr->states.access_state != MPIDI_RMA_FENCE_ISSUED &&
                            win_ptr->states.access_state != MPIDI_RMA_FENCE_GRANTED,
                            mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
    }
    else {
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960
        MPIU_ERR_CHKANDJUMP(win_ptr->states.access_state != MPIDI_RMA_PER_TARGET,
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                            mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
    }
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    if (dest != MPI_PROC_NULL) {
        /* check if we lock the same target window more than once. */
        mpi_errno = MPIDI_CH3I_Win_find_target(win_ptr, dest, &target);
        if (mpi_errno != MPI_SUCCESS) MPIU_ERR_POP(mpi_errno);
        MPIU_ERR_CHKANDJUMP(target != NULL, mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
    }
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971
    /* Error handling is finished. */
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973
    if (win_ptr->lock_epoch_count == 0) {
974
        /* Set window access state properly. */
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        win_ptr->states.access_state = MPIDI_RMA_PER_TARGET;
        num_passive_win++;
    }
    win_ptr->lock_epoch_count++;
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980
    if (dest == MPI_PROC_NULL)
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        goto finish_lock;
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    if (win_ptr->shm_allocated == TRUE) {
        MPIDI_Comm_get_vc(win_ptr->comm_ptr, rank, &orig_vc);
        MPIDI_Comm_get_vc(win_ptr->comm_ptr, dest, &target_vc);
        if (orig_vc->node_id == target_vc->node_id)
            shm_target = TRUE;
988
    }
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    /* Create a new target. */
    mpi_errno = MPIDI_CH3I_Win_create_target(win_ptr, dest, &target);
    if (mpi_errno != MPI_SUCCESS) MPIU_ERR_POP(mpi_errno);
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    /* Store lock_state (CALLED/ISSUED/GRANTED), lock_type (SHARED/EXCLUSIVE),
       lock_mode (MODE_NOCHECK). */
    if (assert & MPI_MODE_NOCHECK)
        target->access_state = MPIDI_RMA_LOCK_GRANTED;
    else
        target->access_state = MPIDI_RMA_LOCK_CALLED;
    target->lock_type = lock_type;
    target->lock_mode = assert;

    /* If Destination is myself or process on SHM, acquire the lock,
       wait until lock is granted. */
    if (!(assert & MPI_MODE_NOCHECK) && (dest == rank || shm_target)) {
        mpi_errno = MPIDI_CH3I_RMA_Make_progress_target(win_ptr, dest, &made_progress);
        if (mpi_errno != MPI_SUCCESS)
1008 1009
            MPIU_ERR_POP(mpi_errno);

1010 1011 1012
        while (target->access_state != MPIDI_RMA_LOCK_GRANTED) {
            mpi_errno = wait_progress_engine();
            if (mpi_errno != MPI_SUCCESS)
1013
                MPIU_ERR_POP(mpi_errno);
1014
        }
1015
    }
1016

1017 1018 1019 1020 1021 1022
 finish_lock:
    if (win_ptr->lock_epoch_count == 1) {
        /* BEGINNING synchronization: the following counter should be zero. */
        MPIU_Assert(win_ptr->accumulated_ops_cnt == 0);
    }

1023 1024 1025
    /* Ensure ordering of load/store operations. */
    if (win_ptr->shm_allocated == TRUE) {
        OPA_read_write_barrier();
1026 1027
    }

1028 1029 1030 1031 1032 1033 1034
  fn_exit:
    MPIDI_RMA_FUNC_EXIT(MPID_STATE_MPIDI_WIN_LOCK);
    return mpi_errno;
    /* --BEGIN ERROR HANDLING-- */
  fn_fail:
    goto fn_exit;
    /* --END ERROR HANDLING-- */
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}

#undef FUNCNAME
1038
#define FUNCNAME MPIDI_Win_unlock
1039 1040
#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
1041
int MPIDI_Win_unlock(int dest, MPID_Win *win_ptr)
1042
{
1043 1044 1045 1046
    int made_progress = 0;
    int local_completed = 0, remote_completed = 0;
    MPIDI_RMA_Target_t *target = NULL;
    enum MPIDI_RMA_sync_types sync_flag;
1047
    int progress_engine_triggered = 0;
1048
    int mpi_errno = MPI_SUCCESS;
1049
    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_UNLOCK);
1050

1051
    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_UNLOCK);
1052

1053
    MPIU_ERR_CHKANDJUMP(win_ptr->states.access_state != MPIDI_RMA_PER_TARGET,
1054
                        mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
1055

1056
    /* Ensure ordering of load/store operations. */
1057
    if (win_ptr->shm_allocated) {
1058 1059
        OPA_read_write_barrier();
    }
1060

1061