X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=rts%2Fposix%2FOSThreads.c;fp=rts%2Fposix%2FOSThreads.c;h=d4d43821344dd29319a8c06e4a526ad41164aea4;hb=97c4b27494addf0231724ca8339e818511256dcf;hp=84b111fcb7404f4795a9b51be19f5b1583352ad3;hpb=a664d7385d97a2e4743d448aa3dddd911190f472;p=ghc-hetmet.git

diff --git a/rts/posix/OSThreads.c b/rts/posix/OSThreads.c
index 84b111f..d4d4382 100644
--- a/rts/posix/OSThreads.c
+++ b/rts/posix/OSThreads.c
@@ -23,6 +23,11 @@
 #include <string.h>
 #endif
 
+#if defined(darwin_HOST_OS)
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#endif
+
 #if !defined(HAVE_PTHREAD_H)
 #error pthreads.h is required for the threaded RTS on Posix platforms
 #endif
@@ -196,12 +201,16 @@ nat
 getNumberOfProcessors (void)
 {
     static nat nproc = 0;
+    size_t size = sizeof(nat);
 
     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);
+#elif defined(darwin_HOST_OS)
+        if(0 != sysctlbyname("hw.ncpu",&nproc,&size,NULL,0))
+            nproc = 1;
 #else
         nproc = 1;
 #endif