start to stub out client example

examples/multiplex/Makefile.subdir

-noinst_PROGRAMS += examples/multiplex/margo-example-mp-server
+noinst_PROGRAMS += examples/multiplex/margo-example-mp-server examples/multiplex/margo-example-mp-client
 
 examples_multiplex_margo_example_mp_server_SOURCES = \
  examples/multiplex/margo-example-mp-server.c \
  examples/multiplex/svc1-server.c \
  examples/multiplex/svc2-server.c
+
+examples_multiplex_margo_example_mp_client_SOURCES = \
+ examples/multiplex/margo-example-mp-client.c \
+ examples/multiplex/svc1-client.c

examples/multiplex/margo-example-mp-client.c

+/*
+ * (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-client.h"
+
+static hg_id_t my_rpc_shutdown_id;
+
+int main(int argc, char **argv) 
+{
+    int i;
+    int ret;
+    margo_instance_id mid;
+    hg_context_t *hg_context;
+    hg_class_t *hg_class;
+    hg_addr_t svr_addr = HG_ADDR_NULL;
+    hg_handle_t handle;
+    char proto[12] = {0};
+  
+    if(argc != 2)
+    {
+        fprintf(stderr, "Usage: ./client <server_addr>\n");
+        return(-1);
+    }
+       
+    /* boilerplate HG initialization steps */
+    /***************************************/
+
+    /* initialize Mercury using the transport portion of the destination
+     * address (i.e., the part before the first : character if present)
+     */
+    for(i=0; i<11 && argv[1][i] != '\0' && argv[1][i] != ':'; i++)
+        proto[i] = argv[1][i];
+    hg_class = HG_Init(proto, HG_FALSE);
+    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);
+    }
+
+    /* 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);
+
+    /* register core RPC */
+    my_rpc_shutdown_id = MERCURY_REGISTER(hg_class, "my_shutdown_rpc", void, void, 
+        NULL);
+
+    /* find addr for server */
+    ret = margo_addr_lookup(mid, argv[1], &svr_addr);
+    assert(ret == 0);
+
+    svc1_do_thing(mid, svr_addr, 1);
+
+    /* send one rpc to server to shut it down */
+    /* create handle */
+    ret = HG_Create(hg_context, svr_addr, my_rpc_shutdown_id, &handle);
+    assert(ret == 0);
+
+    margo_forward(mid, handle, NULL);
+
+    HG_Addr_free(hg_class, svr_addr);
+
+    /* shut down everything */
+    margo_finalize(mid);
+    
+    ABT_finalize();
+
+    HG_Context_destroy(hg_context);
+    HG_Finalize(hg_class);
+
+    return(0);
+}
+
+

examples/multiplex/svc1-client.c

+/*
+ * (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 "svc1-client.h"
+#include "svc1-proto.h"
+
+/* NOTE: just making these global for test example, would be cleaner if there
+ * were an instance pointer for the client.
+ */
+static hg_id_t svc1_do_thing_id = -1;
+static hg_id_t svc1_do_other_thing_id = -1;
+
+int svc1_register_client(margo_instance_id mid)
+{
+
+    svc1_do_thing_id = MERCURY_REGISTER(margo_get_class(mid), "svc1_do_thing", 
+        svc1_do_thing_in_t, svc1_do_thing_out_t, NULL);
+
+    svc1_do_other_thing_id = MERCURY_REGISTER(margo_get_class(mid), "svc1_do_other_thing", 
+        svc1_do_other_thing_in_t, svc1_do_other_thing_out_t, NULL);
+
+    return(0);
+}
+
+void svc1_do_thing(margo_instance_id mid, hg_addr_t svr_addr, uint32_t mplex_id)
+{
+    hg_handle_t handle;
+    svc1_do_thing_in_t in;
+    svc1_do_thing_out_t out;
+    int ret;
+    hg_size_t size;
+    void* buffer;
+    struct hg_info *hgi;
+
+    /* allocate buffer for bulk transfer */
+    size = 512;
+    buffer = calloc(1, 512);
+    assert(buffer);
+    sprintf((char*)buffer, "Hello world!\n");
+
+    /* create handle */
+    ret = HG_Create(margo_get_context(mid), svr_addr, svc1_do_thing_id, &handle);
+    assert(ret == 0);
+
+    /* register buffer for rdma/bulk access by server */
+    hgi = HG_Get_info(handle);
+    assert(hgi);
+    ret = HG_Bulk_create(hgi->hg_class, 1, &buffer, &size, 
+        HG_BULK_READ_ONLY, &in.bulk_handle);
+    assert(ret == 0);
+
+    hgi->mplex_id = mplex_id;
+
+    /* Send rpc. Note that we are also transmitting the bulk handle in the
+     * input struct.  It was set above. 
+     */ 
+    in.input_val = 0;
+    margo_forward(mid, handle, &in);
+
+    /* decode response */
+    ret = HG_Get_output(handle, &out);
+    assert(ret == 0);
+
+    /* clean up resources consumed by this rpc */
+    HG_Bulk_free(in.bulk_handle);
+    HG_Free_output(handle, &out);
+    HG_Destroy(handle);
+    free(buffer);
+
+    return;
+}
+

examples/multiplex/svc1-client.h

@@ -9,4 +9,6 @@
 
 #include <margo.h>
 
+void svc1_do_thing(margo_instance_id mid, hg_addr_t svr_addr, uint32_t mplex_id);
+
 #endif /* __SVC1_CLIENT */