1 /* Copyright (c) 2013-2014. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
9 #include "msg_private.h"
10 #include "xbt/synchro.h"
12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_synchro, msg, "Logging specific to MSG (synchro)");
14 /** @addtogroup msg_synchro
19 /** @brief creates a semaphore object of the given initial capacity */
20 msg_sem_t MSG_sem_init(int initial_value) {
21 return simcall_sem_init(initial_value);
24 /** @brief locks on a semaphore object */
25 void MSG_sem_acquire(msg_sem_t sem) {
26 simcall_sem_acquire(sem);
29 /** @brief locks on a semaphore object up until the provided timeout expires */
30 msg_error_t MSG_sem_acquire_timeout(msg_sem_t sem, double timeout) {
31 msg_error_t res = MSG_OK;
33 simcall_sem_acquire_timeout(sem,timeout);
35 if (e.category == timeout_error)
42 /** @brief releases the semaphore object */
43 void MSG_sem_release(msg_sem_t sem) {
44 simcall_sem_release(sem);
47 int MSG_sem_get_capacity(msg_sem_t sem) {
48 return simcall_sem_get_capacity(sem);
51 void MSG_sem_destroy(msg_sem_t sem) {
52 SIMIX_sem_destroy(sem);
55 /** @brief returns a boolean indicating if this semaphore would block at this very specific time
57 * Note that the returned value may be wrong right after the function call, when you try to use it...
58 * But that's a classical semaphore issue, and SimGrid's semaphore are not different to usual ones here.
60 int MSG_sem_would_block(msg_sem_t sem) {
61 return simcall_sem_would_block(sem);
64 /*-**** barrier related functions ****-*/
65 typedef struct s_msg_bar {
68 unsigned int arrived_processes;
69 unsigned int expected_processes;
72 /** @brief Initializes a barrier, with count elements */
73 msg_bar_t MSG_barrier_init(unsigned int count) {
74 msg_bar_t bar = xbt_new0(s_msg_bar, 1);
75 bar->expected_processes = count;
76 bar->arrived_processes = 0;
77 bar->mutex = xbt_mutex_init();
78 bar->cond = xbt_cond_init();
82 /** @brief Initializes a barrier, with count elements */
83 void MSG_barrier_destroy(msg_bar_t bar) {
84 xbt_mutex_destroy(bar->mutex);
85 xbt_cond_destroy(bar->cond);
89 /** @brief Performs a barrier already initialized */
90 int MSG_barrier_wait(msg_bar_t bar) {
91 xbt_mutex_acquire(bar->mutex);
92 bar->arrived_processes++;
93 if (bar->arrived_processes == bar->expected_processes) {
94 xbt_cond_broadcast(bar->cond);
95 xbt_mutex_release(bar->mutex);
96 bar->arrived_processes = 0;
97 return MSG_BARRIER_SERIAL_PROCESS;
100 xbt_cond_wait(bar->cond, bar->mutex);
101 xbt_mutex_release(bar->mutex);