[Platform] Increase default stack size on Mac OS X to 1MB.

src/base/platform/platform-posix.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Platform-specific code for POSIX goes here. This is not a platform on its
 // own, but contains the parts which are the same across the POSIX platforms
 // Linux, MacOS, FreeBSD, OpenBSD, NetBSD and QNX.
 
 #include <errno.h>
 #include <limits.h>
@@ skipping 602 matching lines @@
 }
 
 
 void Thread::Start() {
   int result;
   pthread_attr_t attr;
   memset(&attr, 0, sizeof(attr));
   result = pthread_attr_init(&attr);
   DCHECK_EQ(0, result);
   size_t stack_size = stack_size_;
-#if V8_OS_AIX
   if (stack_size == 0) {
-    // Default on AIX is 96KB -- bump up to 2MB
+#if V8_OS_MACOSX
+    // Default on Mac OS X is 512kB -- bump up to 1MB
+    stack_size = 1 * 1024 * 1024;
+#elif V8_OS_AIX
+    // Default on AIX is 96kB -- bump up to 2MB
     stack_size = 2 * 1024 * 1024;
+#endif
   }
-#endif
   if (stack_size > 0) {
     result = pthread_attr_setstacksize(&attr, stack_size);
     DCHECK_EQ(0, result);
   }
   {
     LockGuard<Mutex> lock_guard(&data_->thread_creation_mutex_);
     result = pthread_create(&data_->thread_, &attr, ThreadEntry, this);
   }
   DCHECK_EQ(0, result);
   result = pthread_attr_destroy(&attr);
@@ skipping 126 matching lines @@
 
 void Thread::SetThreadLocal(LocalStorageKey key, void* value) {
   pthread_key_t pthread_key = LocalKeyToPthreadKey(key);
   int result = pthread_setspecific(pthread_key, value);
   DCHECK_EQ(0, result);
   USE(result);
 }
 
 }  // namespace base
 }  // namespace v8