margo-example-mp-server.c 3.78 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152
/*
 * (C) 2015 The University of Chicago
 * 
 * See COPYRIGHT in top-level directory.
 */

#include <stdio.h>
#include <assert.h>
#include <unistd.h>
#include <abt.h>
#include <abt-snoozer.h>
#include <margo.h>

#include "svc1.h"

/* example server program that starts a skeleton for sub-services within
 * this process to register with
 */

/* this is a "common" rpc that is handled by the core daemon
 */

static void my_rpc_shutdown_ult(hg_handle_t handle)
{
    hg_return_t hret;
    struct hg_info *hgi;
    margo_instance_id mid;

    printf("Got RPC request to shutdown\n");

    hgi = HG_Get_info(handle);
    assert(hgi);
    mid = margo_hg_class_to_instance(hgi->hg_class);

    hret = margo_respond(mid, handle, NULL);
    assert(hret == HG_SUCCESS);

    HG_Destroy(handle);

    /* NOTE: we assume that the server daemon is using
     * margo_wait_for_finalize() to suspend until this RPC executes, so there
     * is no need to send any extra signal to notify it.
     */
    margo_finalize(mid);

    return;
}
DEFINE_MARGO_RPC_HANDLER(my_rpc_shutdown_ult)


int main(int argc, char **argv) 
{
    int ret;
    margo_instance_id mid;
    hg_context_t *hg_context;
    hg_class_t *hg_class;
    char proto[12] = {0};
    int i;
    hg_addr_t addr_self;
    char addr_self_string[128];
    hg_size_t addr_self_string_sz = 128;

    if(argc != 2)
    {
        fprintf(stderr, "Usage: ./server <listen_addr>\n");
        fprintf(stderr, "Example: ./server na+sm://\n");
        return(-1);
    }

    /* boilerplate HG initialization steps */
    /***************************************/
    hg_class = HG_Init(argv[1], HG_TRUE);
    if(!hg_class)
    {
        fprintf(stderr, "Error: HG_Init()\n");
        return(-1);
    }
    hg_context = HG_Context_create(hg_class);
    if(!hg_context)
    {
        fprintf(stderr, "Error: HG_Context_create()\n");
        HG_Finalize(hg_class);
        return(-1);
    }

    /* figure out what address this server is listening on */
    ret = HG_Addr_self(hg_class, &addr_self);
    if(ret != HG_SUCCESS)
    {
        fprintf(stderr, "Error: HG_Addr_self()\n");
        HG_Context_destroy(hg_context);
        HG_Finalize(hg_class);
        return(-1);
    }
    ret = HG_Addr_to_string(hg_class, addr_self_string, &addr_self_string_sz, addr_self);
    if(ret != HG_SUCCESS)
    {
        fprintf(stderr, "Error: HG_Addr_self()\n");
        HG_Context_destroy(hg_context);
        HG_Finalize(hg_class);
        HG_Addr_free(hg_class, addr_self);
        return(-1);
    }
    HG_Addr_free(hg_class, addr_self);

    for(i=0; i<11 && argv[1][i] != '\0' && argv[1][i] != ':'; i++)
        proto[i] = argv[1][i];
    printf("# accepting RPCs on address \"%s://%s\"\n", proto, addr_self_string);

    /* set up argobots */
    /***************************************/
    ret = ABT_init(argc, argv);
    if(ret != 0)
    {
        fprintf(stderr, "Error: ABT_init()\n");
        return(-1);
    }

    /* set primary ES to idle without polling */
    ret = ABT_snoozer_xstream_self_set();
    if(ret != 0)
    {
        fprintf(stderr, "Error: ABT_snoozer_xstream_self_set()\n");
        return(-1);
    }

    /* actually start margo */
    /***************************************/
    mid = margo_init(0, 0, hg_context);
    assert(mid);

    /* register svc1, with mplex_id 1, to execute on the default handler pool
     * used by Margo
     */
    ret = svc1_register(mid, margo_get_handler_pool(mid), 1);
    assert(ret == 0);

    /* NOTE: there isn't anything else for the server to do at this point
     * except wait for itself to be shut down.  The
     * margo_wait_for_finalize() call here yields to let Margo drive
     * progress until that happens.
     */
    margo_wait_for_finalize(mid);

    ABT_finalize();

    HG_Context_destroy(hg_context);
    HG_Finalize(hg_class);

    return(0);
}