ch3u_rma_sync.c 69.6 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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            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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    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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    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);

593
    if ((assert & MPI_MODE_NOCHECK) == 0) {
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594
        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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    win_ptr->states.access_state = MPIDI_RMA_PSCW_ISSUED;
    num_active_issued_win++;
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 finish_start:
    /* 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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688
#undef FUNCNAME
689
#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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703
    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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743 744 745 746 747 748 749 750
        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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    /* 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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790
    win_ptr->states.access_state = MPIDI_RMA_NONE;
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792
 finish_complete:
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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;

799
    MPIU_Assert(win_ptr->active_req_cnt == 0);
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801 802 803 804 805 806 807 808 809 810 811 812 813
    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);
    }

814 815
  fn_exit:
    MPIDI_RMA_FUNC_EXIT(MPID_STATE_MPIDI_WIN_COMPLETE);
816
    return mpi_errno;
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    /* --BEGIN ERROR HANDLING-- */
  fn_fail:
    goto fn_exit;
    /* --END ERROR HANDLING-- */
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}
822

823 824


825
#undef FUNCNAME
826
#define FUNCNAME MPIDI_Win_wait
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#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
829
int MPIDI_Win_wait(MPID_Win * win_ptr)
830
{
831
    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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837
    MPIU_ERR_CHKANDJUMP(win_ptr->states.exposure_state != MPIDI_RMA_PSCW_EXPO,
838
                        mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
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840
    /* wait for all operations from other processes to finish */
841 842 843 844
    while (win_ptr->at_completion_counter) {
        mpi_errno = wait_progress_engine();
        if (mpi_errno != MPI_SUCCESS)
            MPIU_ERR_POP(mpi_errno);
845 846 847 848

        /* Mark that we triggered the progress engine
           in this function call. */
        progress_engine_triggered = 1;
849 850
    }

851 852
    win_ptr->states.exposure_state = MPIDI_RMA_NONE;

853 854 855 856 857 858 859 860 861 862 863 864 865 866
 finish_wait:
    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);
    }

867 868 869 870 871
    /* Ensure ordering of load/store operations. */
    if (win_ptr->shm_allocated == TRUE) {
        OPA_read_write_barrier();
    }

872 873
  fn_exit:
    MPIDI_RMA_FUNC_EXIT(MPID_STATE_MPIDI_WIN_WAIT);
874
    return mpi_errno;
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    /* --BEGIN ERROR HANDLING-- */
  fn_fail:
    goto fn_exit;
    /* --END ERROR HANDLING-- */
879 880
}

881

882
#undef FUNCNAME
883
#define FUNCNAME MPIDI_Win_test
884 885
#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
886
int MPIDI_Win_test(MPID_Win * win_ptr, int *flag)
887 888
{
    int mpi_errno = MPI_SUCCESS;
889
    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_TEST);
890

891
    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_TEST);
892

893
    MPIU_ERR_CHKANDJUMP(win_ptr->states.exposure_state != MPIDI_RMA_PSCW_EXPO,
894
                        mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
895

896 897
    mpi_errno = MPID_Progress_test();
    if (mpi_errno != MPI_SUCCESS) {
898
	MPIU_ERR_POP(mpi_errno);
899 900
    }

901 902
    *flag = (win_ptr->at_completion_counter) ? 0 : 1;
    if (*flag) {
903 904
        win_ptr->states.exposure_state = MPIDI_RMA_NONE;

905 906 907
        /* Ensure ordering of load/store operations. */
        if (win_ptr->shm_allocated == TRUE) {
            OPA_read_write_barrier();
908 909 910
        }
    }

911
  fn_exit:
912
    MPIDI_RMA_FUNC_EXIT(MPID_STATE_MPIDI_WIN_TEST);
913
    return mpi_errno;
914
    /* --BEGIN ERROR HANDLING-- */
915
  fn_fail:
916
    goto fn_exit;
917
    /* --END ERROR HANDLING-- */
918 919
}

920

921 922 923 924 925 926
/********************************************************************************/
/* 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)                                               */
/********************************************************************************/

927
#undef FUNCNAME
928
#define FUNCNAME MPIDI_Win_lock
929 930
#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
931
int MPIDI_Win_lock(int lock_type, int dest, int assert, MPID_Win * win_ptr)
932
{
933 934 935 936 937
    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;
938
    int mpi_errno = MPI_SUCCESS;
939
    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_LOCK);
940

941
    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_LOCK);
942

943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960
    /* 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 {
        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.access_state != MPIDI_RMA_PER_TARGET,
                            mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
    }
961

962 963 964 965 966 967
    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");
    }
968

969
    /* Error handling is finished. */
970

971 972 973 974 975
    if (win_ptr->lock_epoch_count == 0) {
        win_ptr->states.access_state = MPIDI_RMA_PER_TARGET;
        num_passive_win++;
    }
    win_ptr->lock_epoch_count++;
976

977
    if (dest == MPI_PROC_NULL)
978
        goto finish_lock;
979

980 981 982 983 984
    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;
985
    }
986

987 988 989
    /* 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);
990

991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004
    /* 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)
1005 1006
            MPIU_ERR_POP(mpi_errno);

1007 1008 1009
        while (target->access_state != MPIDI_RMA_LOCK_GRANTED) {
            mpi_errno = wait_progress_engine();
            if (mpi_errno != MPI_SUCCESS)
1010
                MPIU_ERR_POP(mpi_errno);
1011
        }
1012
    }
1013

1014 1015 1016 1017 1018 1019
 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);
    }

1020 1021 1022
    /* Ensure ordering of load/store operations. */
    if (win_ptr->shm_allocated == TRUE) {
        OPA_read_write_barrier();
1023 1024
    }

1025 1026 1027 1028 1029 1030 1031
  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-- */
1032 1033 1034
}

#undef FUNCNAME
1035
#define FUNCNAME MPIDI_Win_unlock
1036 1037
#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
1038
int MPIDI_Win_unlock(int dest, MPID_Win *win_ptr)
1039
{
1040 1041 1042 1043
    int made_progress = 0;
    int local_completed = 0, remote_completed = 0;
    MPIDI_RMA_Target_t *target = NULL;
    enum MPIDI_RMA_sync_types sync_flag;
1044
    int progress_engine_triggered = 0;
1045
    int mpi_errno = MPI_SUCCESS;
1046
    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_UNLOCK);
1047

1048
    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_UNLOCK);
1049

1050
    MPIU_ERR_CHKANDJUMP(win_ptr->states.access_state != MPIDI_RMA_PER_TARGET,
1051
                        mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
1052

1053
    /* Ensure ordering of load/store operations. */
1054
    if (win_ptr->shm_allocated) {
1055 1056
        OPA_read_write_barrier();
    }
1057

1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
    if (dest == MPI_PROC_NULL)
        goto finish_unlock;

    /* Find or recreate target. */
    mpi_errno = MPIDI_CH3I_Win_find_target(win_ptr, dest, &target);
    if (mpi_errno != MPI_SUCCESS)
        MPIU_ERR_POP(mpi_errno);
    if (target == NULL) {
        mpi_errno = MPIDI_CH3I_Win_create_target(win_ptr, dest, &target);
        if (mpi_errno != MPI_SUCCESS)
1068
            MPIU_ERR_POP(mpi_errno);
1069
        target->access_state = MPIDI_RMA_LOCK_GRANTED;
1070 1071
    }

1072 1073 1074 1075 1076 1077 1078 1079 1080
    /* Set sync_flag in sync struct. */
    if (target->lock_mode & MPI_MODE_NOCHECK)
        sync_flag = MPIDI_RMA_SYNC_FLUSH;
    else
        sync_flag = MPIDI_RMA_SYNC_UNLOCK;
    if (target->sync.sync_flag < sync_flag) {
        target->sync.sync_flag = sync_flag;