document that we really need xbt_os_thread_atfork (for tesh+mmalloc)

[simgrid.git] / src / xbt / xbt_os_thread.c

diff --git a/src/xbt/xbt_os_thread.c b/src/xbt/xbt_os_thread.c
index 68198a8..08e82d5 100644 (file)
--- a/src/xbt/xbt_os_thread.c
+++ b/src/xbt/xbt_os_thread.c
@@ -74,8 +74,7 @@ static xbt_running_ctx_t *_os_thread_get_running_ctx(void)
 static void _os_thread_ex_terminate(xbt_ex_t * e)
 {
   xbt_ex_display(e);
-
-  abort();
+  xbt_abort();
   /* FIXME: there should be a configuration variable to choose to kill everyone or only this one */
 }
 
@@ -134,11 +133,12 @@ void xbt_os_thread_mod_postexit(void)
   __xbt_ex_terminate = &__xbt_ex_terminate_default;
 }
 
+/* this function is critical to tesh+mmalloc, don't mess with it */
 int xbt_os_thread_atfork(void (*prepare)(void),
                          void (*parent)(void), void (*child)(void))
 {
 #ifdef WIN32
-       return 0; //pthread_atfork is not implemented in pthread.h on windows
+  THROW_UNIMPLEMENTED; //pthread_atfork is not implemented in pthread.h on windows
 #else
   return pthread_atfork(prepare, parent, child);
 #endif
@@ -642,7 +642,7 @@ typedef struct xbt_os_thread_ {
 #endif
 
 /* the default size of the stack of the threads (in bytes)*/
-#define XBT_DEFAULT_THREAD_STACK_SIZE  4096
+#define XBT_DEFAULT_THREAD_STACK_SIZE  4096
 
 /* key to the TLS containing the xbt_os_thread_t structure */
 static unsigned long xbt_self_thread_key;
@@ -1163,6 +1163,33 @@ void xbt_os_sem_get_value(xbt_os_sem_t sem, int *svalue)
 
 #endif
 
+
+/** @brief Returns the amount of cores on the current host */
+int xbt_os_get_numcores(void) {
+#ifdef WIN32
+    SYSTEM_INFO sysinfo;
+    GetSystemInfo(&sysinfo);
+    return sysinfo.dwNumberOfProcessors;
+#elif MACOS
+    int nm[2];
+    size_t len = 4;
+    uint32_t count;
+
+    nm[0] = CTL_HW; nm[1] = HW_AVAILCPU;
+    sysctl(nm, 2, &count, &len, NULL, 0);
+
+    if(count < 1) {
+        nm[1] = HW_NCPU;
+        sysctl(nm, 2, &count, &len, NULL, 0);
+        if(count < 1) { count = 1; }
+    }
+    return count;
+#else
+    return sysconf(_SC_NPROCESSORS_ONLN);
+#endif
+}
+
+
 /***** reentrant mutexes *****/
 typedef struct xbt_os_rmutex_ {
   xbt_os_mutex_t mutex;