Issue #1751 -- Remove XP_MACOSX conditionals and support files from /xpcom

xpcom/threads/nsThread.cpp

@@ -52,11 +52,6 @@
 #define HAVE_SCHED_SETAFFINITY
 #endif
 
-#ifdef XP_MACOSX
-#include <mach/mach.h>
-#include <mach/thread_policy.h>
-#endif
-
 #ifdef MOZ_CANARY
 # include <unistd.h>
 # include <execinfo.h>
@@ -375,16 +370,6 @@ SetThreadAffinity(unsigned int cpu)
   sched_setaffinity(0, sizeof(cpus), &cpus);
   // Don't assert sched_setaffinity's return value because it intermittently (?)
   // fails with EINVAL on Linux x64 try runs.
-#elif defined(XP_MACOSX)
-  // OS X does not provide APIs to pin threads to specific processors, but you
-  // can tag threads as belonging to the same "affinity set" and the OS will try
-  // to run them on the same processor. To run threads on different processors,
-  // tag them as belonging to different affinity sets. Tag 0, the default, means
-  // "no affinity" so let's pretend each CPU has its own tag `cpu+1`.
-  thread_affinity_policy_data_t policy;
-  policy.affinity_tag = cpu + 1;
-  MOZ_ALWAYS_TRUE(thread_policy_set(mach_thread_self(), THREAD_AFFINITY_POLICY,
-                                    &policy.affinity_tag, 1) == KERN_SUCCESS);
 #elif defined(XP_WIN)
   MOZ_ALWAYS_TRUE(SetThreadIdealProcessor(GetCurrentThread(), cpu) != -1);
 #endif