X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=rts%2Fposix%2FOSThreads.c;h=84b111fcb7404f4795a9b51be19f5b1583352ad3;hb=5cdb1ff5e889d3361e80e7b01bcb90b682dd9136;hp=cff37824cbc40cf1485d87c29295684be8ff0ab7;hpb=a91cc8496bf4ea7fe1e3ad9d97836152f3939ffa;p=ghc-hetmet.git

diff --git a/rts/posix/OSThreads.c b/rts/posix/OSThreads.c
index cff3782..84b111f 100644
--- a/rts/posix/OSThreads.c
+++ b/rts/posix/OSThreads.c
@@ -7,8 +7,9 @@
  *
  * --------------------------------------------------------------------------*/
 
-#if defined(DEBUG) && defined(__linux__)
+#if defined(__linux__)
 /* We want GNU extensions in DEBUG mode for mutex error checking */
+/* We also want the affinity API, which requires _GNU_SOURCE */
 #define _GNU_SOURCE
 #endif
 
@@ -26,6 +27,18 @@
 #error pthreads.h is required for the threaded RTS on Posix platforms
 #endif
 
+#if defined(HAVE_SCHED_H)
+#include <sched.h>
+#endif
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#if defined(darwin_HOST_OS)
+#include <mach/mach.h>
+#endif
+
 /*
  * This (allegedly) OS threads independent layer was initially
  * abstracted away from code that used Pthreads, so the functions
@@ -93,19 +106,32 @@ osThreadId()
   return pthread_self();
 }
 
+rtsBool
+osThreadIsAlive(OSThreadId id STG_UNUSED)
+{
+    // no good way to implement this on POSIX, AFAICT.  Returning true
+    // is safe.
+    return rtsTrue;
+}
+
 void
 initMutex(Mutex* pMut)
 {
-#if defined(DEBUG) && defined(linux_HOST_OS)
+#if defined(DEBUG)
     pthread_mutexattr_t attr;
     pthread_mutexattr_init(&attr);
-    pthread_mutexattr_settype(&attr,PTHREAD_MUTEX_ERRORCHECK_NP);
+    pthread_mutexattr_settype(&attr,PTHREAD_MUTEX_ERRORCHECK);
     pthread_mutex_init(pMut,&attr);
 #else
     pthread_mutex_init(pMut,NULL);
 #endif
     return;
 }
+void
+closeMutex(Mutex* pMut)
+{
+    pthread_mutex_destroy(pMut);
+}
 
 void
 newThreadLocalKey (ThreadLocalKey *key)
@@ -135,6 +161,15 @@ setThreadLocalVar (ThreadLocalKey *key, void *value)
     }
 }
 
+void
+freeThreadLocalKey (ThreadLocalKey *key)
+{
+    int r;
+    if ((r = pthread_key_delete(*key)) != 0) {
+	barf("freeThreadLocalKey: %s", strerror(r));
+    }
+}
+
 static void *
 forkOS_createThreadWrapper ( void * entry )
 {
@@ -157,6 +192,65 @@ forkOS_createThread ( HsStablePtr entry )
     return result;
 }
 
+nat
+getNumberOfProcessors (void)
+{
+    static nat nproc = 0;
+
+    if (nproc == 0) {
+#if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_ONLN)
+        nproc = sysconf(_SC_NPROCESSORS_ONLN);
+#elif defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_CONF)
+        nproc = sysconf(_SC_NPROCESSORS_CONF);
+#else
+        nproc = 1;
+#endif
+    }
+
+    return nproc;
+}
+
+#if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_SETAFFINITY)
+// Schedules the thread to run on CPU n of m.  m may be less than the
+// number of physical CPUs, in which case, the thread will be allowed
+// to run on CPU n, n+m, n+2m etc.
+void
+setThreadAffinity (nat n, nat m)
+{
+    nat nproc;
+    cpu_set_t cs;
+    nat i;
+
+    nproc = getNumberOfProcessors();
+    CPU_ZERO(&cs);
+    for (i = n; i < nproc; i+=m) {
+        CPU_SET(i, &cs);
+    }
+    sched_setaffinity(0, sizeof(cpu_set_t), &cs);
+}
+
+#elif defined(darwin_HOST_OS) && defined(THREAD_AFFINITY_POLICY)
+// Schedules the current thread in the affinity set identified by tag n.
+void
+setThreadAffinity (nat n, nat m GNUC3_ATTRIBUTE(__unused__))
+{
+    thread_affinity_policy_data_t policy;
+
+    policy.affinity_tag = n;
+    thread_policy_set(mach_thread_self(), 
+		      THREAD_AFFINITY_POLICY,
+		      (thread_policy_t) &policy,
+		      THREAD_AFFINITY_POLICY_COUNT);
+}
+
+#else
+void
+setThreadAffinity (nat n GNUC3_ATTRIBUTE(__unused__), 
+		   nat m GNUC3_ATTRIBUTE(__unused__))
+{
+}
+#endif
+
 #else /* !defined(THREADED_RTS) */
 
 int