Logo AND Algorithmique Numérique Distribuée

Public GIT Repository
4acf7a1fec349a4b748de83c70a18232a182e3d9
[simgrid.git] / src / smpi / smpi_receiver.c
1 #include "private.h"
2
3 int smpi_receiver(int argc, char **argv)
4 {
5         smx_process_t self;
6         int rank;
7
8         xbt_fifo_t request_queue;
9         smx_mutex_t request_queue_mutex;
10         xbt_fifo_t message_queue;
11         smx_mutex_t message_queue_mutex;
12         int size;
13
14         int running_hosts_count;
15
16         smpi_mpi_request_t request;
17         smpi_received_message_t message;
18
19         xbt_fifo_item_t request_item;
20         xbt_fifo_item_t message_item;
21
22         self = SIMIX_process_self();
23
24         // make sure root is done before own initialization
25         SIMIX_mutex_lock(smpi_global->start_stop_mutex);
26         if (!smpi_global->root_ready) {
27                 SIMIX_cond_wait(smpi_global->start_stop_cond, smpi_global->start_stop_mutex);
28         }
29         SIMIX_mutex_unlock(smpi_global->start_stop_mutex);
30
31         rank = smpi_mpi_comm_rank_self(smpi_mpi_global->mpi_comm_world);
32         size = smpi_mpi_comm_size(smpi_mpi_global->mpi_comm_world);
33
34         request_queue       = smpi_global->pending_recv_request_queues[rank];
35         request_queue_mutex = smpi_global->pending_recv_request_queues_mutexes[rank];
36         message_queue       = smpi_global->received_message_queues[rank];
37         message_queue_mutex = smpi_global->received_message_queues_mutexes[rank];
38
39         smpi_global->receiver_processes[rank] = self;
40
41         // wait for all nodes to signal initializatin complete
42         SIMIX_mutex_lock(smpi_global->start_stop_mutex);
43         smpi_global->ready_process_count++;
44         if (smpi_global->ready_process_count < 3 * size) {
45                 SIMIX_cond_wait(smpi_global->start_stop_cond, smpi_global->start_stop_mutex);
46         } else {
47                 SIMIX_cond_broadcast(smpi_global->start_stop_cond);
48         }
49         SIMIX_mutex_unlock(smpi_global->start_stop_mutex);
50
51         do {
52                 request = NULL;
53                 message = NULL;
54
55                 // FIXME: better algorithm, maybe some kind of balanced tree? or a heap?
56
57                 // FIXME: not the best way to request multiple locks...
58                 SIMIX_mutex_lock(request_queue_mutex);
59                 SIMIX_mutex_lock(message_queue_mutex);
60                 for (request_item = xbt_fifo_get_first_item(request_queue);
61                         NULL != request_item;
62                         request_item = xbt_fifo_get_next_item(request_item)) {
63                         request = xbt_fifo_get_item_content(request_item);
64                         for (message_item = xbt_fifo_get_first_item(message_queue);
65                                 NULL != message_item;
66                                 message_item = xbt_fifo_get_next_item(message_item)) {
67                                 message = xbt_fifo_get_item_content(message_item);
68                                 if (request->comm == message->comm &&
69                                                 (MPI_ANY_SOURCE == request->src || request->src == message->src) &&
70                                                 request->tag == message->tag) {
71                                         xbt_fifo_remove_item(request_queue, request_item);
72                                         xbt_fifo_remove_item(message_queue, message_item);
73                                         goto stopsearch;
74                                 }
75                         }
76                 }
77 stopsearch:
78                 SIMIX_mutex_unlock(message_queue_mutex);
79                 SIMIX_mutex_unlock(request_queue_mutex);
80
81                 if (NULL == request || NULL == message) {
82                         SIMIX_process_suspend(self);
83                 } else {
84
85                         SIMIX_mutex_lock(request->mutex);
86
87                         memcpy(request->buf, message->buf, request->datatype->size * request->count);
88                         request->src = message->src;
89                         request->completed = 1;
90                         SIMIX_cond_broadcast(request->cond);
91
92                         SIMIX_mutex_unlock(request->mutex);
93
94                         xbt_free(message->buf);
95                         xbt_mallocator_release(smpi_global->message_mallocator, message);
96
97                 }
98
99                 SIMIX_mutex_lock(smpi_global->running_hosts_count_mutex);
100                 running_hosts_count = smpi_global->running_hosts_count;
101                 SIMIX_mutex_unlock(smpi_global->running_hosts_count_mutex);
102
103         } while (0 < running_hosts_count);
104
105         return 0;
106 }