margo.h 7.18 KB
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/*
 * (C) 2015 The University of Chicago
 * 
 * See COPYRIGHT in top-level directory.
 */

#ifndef __MARGO
#define __MARGO

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#ifdef __cplusplus
extern "C" {
#endif

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#include <mercury_bulk.h>
#include <mercury.h>
#include <mercury_macros.h>
#include <abt.h>
#include <ev.h>

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struct margo_instance;
typedef struct margo_instance* margo_instance_id;

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#define MARGO_INSTANCE_NULL ((margo_instance_id)NULL)

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/**
 * Initializes margo library.
 * @param [in] use_progress_thread Boolean flag to use a dedicated thread for
 *                                 running Mercury's progress loop. If false,
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 *                                 it will run in the caller's thread context.
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 * @param [in] rpc_thread_count    Number of threads to use for running RPC
 *                                 calls. A value of 0 directs Margo to execute
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 *                                 RPCs in the caller's thread context.
 *                                 Clients (i.e processes that will *not* 
 *                                 service incoming RPCs) should use a value 
 *                                 of 0. A value of -1 directs Margo to use 
 *                                 the same execution context as that used 
 *                                 for Mercury progress.
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 * @param [in] hg_context
 * @returns margo instance id on success, MARGO_INSTANCE_NULL upon error
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 *
 * NOTE: Servers (processes expecting to service incoming RPC requests) must
 * specify non-zero values for use_progress_thread and rpc_thread_count *or*
 * call margo_wait_for_finalize() after margo_init() to relinguish control to 
 * Margo.
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 */
margo_instance_id margo_init(int use_progress_thread, int rpc_thread_count,
    hg_context_t *hg_context);

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/**
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 * Initializes margo library from given argobots and Mercury instances.
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 * @param [in] progress_pool Argobots pool to drive communication
 * @param [in] handler_pool Argobots pool to service RPC handlers
 * @param [in] hg_context Mercury context
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 * @returns margo instance id on success, MARGO_INSTANCE_NULL upon error
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 */
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margo_instance_id margo_init_pool(ABT_pool progress_pool, ABT_pool handler_pool,
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    hg_context_t *hg_context);
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/**
 * Shuts down margo library and its underlying evfibers and mercury resources
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 * @param [in] mid Margo instance
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 */
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void margo_finalize(margo_instance_id mid);
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/**
 * Suspends the caller until some other entity (e.g. an RPC, thread, or
 * signal handler) invokes margo_finalize().
 *
 * NOTE: This informs Margo that the calling thread no longer needs to be 
 * scheduled for execution if it is sharing an Argobots pool with the
 * progress engine.
 *
 * @param [in] mid Margo instance
 */
void margo_wait_for_finalize(margo_instance_id mid);
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/**
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 * Retrieve the abt_handler pool that was associated with the instance at 
 *    initialization time
 * @param [in] mid Margo instance
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 */
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ABT_pool* margo_get_handler_pool(margo_instance_id mid);
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/**
 * Retrieve the Mercury context that was associated with this instance at
 *    initialization time
 * @param [in] mid Margo instance
 * @return the Mercury context used in margo_init
 */
hg_context_t* margo_get_context(margo_instance_id mid);

/**
 * Retrieve the Mercury class that was associated with this instance at
 *    initialization time
 * @param [in] mid Margo instance
 * @return the Mercury class used in margo_init
 */
hg_class_t* margo_get_class(margo_instance_id mid);

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/**
 * Forward an RPC request to a remote host
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 * @param [in] mid Margo instance
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 * @param [in] handle identifier for the RPC to be sent
 * @param [in] in_struct input argument struct for RPC
 * @returns 0 on success, hg_return_t values on error
 */
hg_return_t margo_forward(
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    margo_instance_id mid,
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    hg_handle_t handle,
    void *in_struct);

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/**
 * Forward an RPC request to a remote host with a user-defined timeout
 * @param [in] mid Margo instance
 * @param [in] handle identifier for the RPC to be sent
 * @param [in] in_struct input argument struct for RPC
 * @param [in] timeout_ms timeout in milliseconds
 * @returns 0 on success, hg_return_t values on error
 */
hg_return_t margo_forward_timed(
    margo_instance_id mid,
    hg_handle_t handle,
    void *in_struct,
    double timeout_ms);

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/**
 * Send an RPC response, waiting for completion before returning
 * control to the calling ULT.
 * Note: this call is typically not needed as RPC listeners need not concern
 * themselves with what happens after an RPC finishes. However, there are cases
 * when this is useful (deferring resource cleanup, calling margo_finalize()
 * for e.g. a shutdown RPC).
 * @param [in] mid Margo instance
 * @param [in] handle identifier for the RPC for which a response is being
 * sent
 * @param [in] out_struct output argument struct for response
 * @return HG_SUCCESS on success, hg_return_t values on error. See HG_Respond.
 */
hg_return_t margo_respond(
    margo_instance_id mid,
    hg_handle_t handle,
    void *out_struct);

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/** 
 * Perform a bulk transfer
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 * @param [in] mid Margo instance
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 * @param [in] op type of operation to perform
 * @param [in] origin_addr remote Mercury address
 * @param [in] origin_handle remote Mercury bulk memory handle
 * @param [in] origin_offset offset into remote bulk memory to access
 * @param [in] local_handle local bulk memory handle
 * @param [in] local_offset offset into local bulk memory to access
 * @param [in] size size (in bytes) of transfer
 * @returns 0 on success, hg_return_t values on error
 */
hg_return_t margo_bulk_transfer(
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    margo_instance_id mid,
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    hg_bulk_op_t op,
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    hg_addr_t origin_addr,
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    hg_bulk_t origin_handle,
    size_t origin_offset,
    hg_bulk_t local_handle,
    size_t local_offset,
    size_t size);

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/**
 * address lookup
 * @param [in] name             lookup name
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 * @param [out] addr            return address
 * @returns HG_SUCCESS on success
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 */
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hg_return_t margo_addr_lookup(
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    margo_instance_id mid,
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    const char   *name,
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    hg_addr_t    *addr);
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/**
 * Suspends the calling ULT for a specified time duration
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 * @param [in] mid Margo instance
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 * @param [in] timeout_ms timeout duration in milliseconds
 */
void margo_thread_sleep(
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    margo_instance_id mid,
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    double timeout_ms);

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/**
 * Retrive the Margo instance that has been associated with a Mercury class
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 * @param [in] cl Mercury class
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 * @returns Margo instance on success, NULL on error
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 */
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margo_instance_id margo_hg_class_to_instance(hg_class_t *cl);
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/**
 * macro that defines a function to glue an RPC handler to a fiber
 * @param [in] __name name of handler function
 */
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#define DEFINE_MARGO_RPC_HANDLER(__name) \
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hg_return_t __name##_handler(hg_handle_t handle) { \
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    int __ret; \
    ABT_pool* __pool; \
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    margo_instance_id __mid; \
    struct hg_info *__hgi; \
    __hgi = HG_Get_info(handle); \
    __mid = margo_hg_class_to_instance(__hgi->hg_class); \
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    __pool = margo_get_handler_pool(__mid); \
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    __ret = ABT_thread_create(*__pool, __name, handle, ABT_THREAD_ATTR_NULL, NULL); \
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    if(__ret != 0) { \
        return(HG_NOMEM_ERROR); \
    } \
    return(HG_SUCCESS); \
}

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/**
 * macro that declares the prototype for a function to glue an RPC 
 * handler to a fiber
 * @param [in] __name name of handler function
 */
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#define DECLARE_MARGO_RPC_HANDLER(__name) hg_return_t __name##_handler(hg_handle_t handle);
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#ifdef __cplusplus
}
#endif

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#endif /* __MARGO */