osx: set the default thread stack size to RLIMIT_STACK

Fixes: https://github.com/libuv/libuv/issues/669
PR-URL: https://github.com/libuv/libuv/pull/671
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

src/unix/thread.c

@@ -27,6 +27,7 @@
 #include <errno.h>
 
 #include <sys/time.h>
+#include <sys/resource.h>  /* getrlimit() */
 
 #undef NANOSEC
 #define NANOSEC ((uint64_t) 1e9)
@@ -55,6 +56,11 @@ static void* uv__thread_start(void *arg)
 int uv_thread_create(uv_thread_t *tid, void (*entry)(void *arg), void *arg) {
   struct thread_ctx* ctx;
   int err;
+  pthread_attr_t* attr;
+#if defined(__APPLE__)
+  pthread_attr_t attr_storage;
+  struct rlimit lim;
+#endif
 
   ctx = uv__malloc(sizeof(*ctx));
   if (ctx == NULL)
@@ -63,7 +69,30 @@ int uv_thread_create(uv_thread_t *tid, void (*entry)(void *arg), void *arg) {
   ctx->entry = entry;
   ctx->arg = arg;
 
-  err = pthread_create(tid, NULL, uv__thread_start, ctx);
+  /* On OSX threads other than the main thread are created with a reduced stack
+   * size by default, adjust it to RLIMIT_STACK.
+   */
+#if defined(__APPLE__)
+  if (getrlimit(RLIMIT_STACK, &lim))
+    abort();
+
+  attr = &attr_storage;
+  if (pthread_attr_init(attr))
+    abort();
+
+  if (lim.rlim_cur != RLIM_INFINITY &&
+      lim.rlim_cur >= PTHREAD_STACK_MIN) {
+    if (pthread_attr_setstacksize(attr, lim.rlim_cur))
+      abort();
+  }
+#else
+  attr = NULL;
+#endif
+
+  err = pthread_create(tid, attr, uv__thread_start, ctx);
+
+  if (attr != NULL)
+    pthread_attr_destroy(attr);
 
   if (err)
     uv__free(ctx);

test/test-list.h

@@ -294,6 +294,7 @@ TEST_DECLARE   (threadpool_cancel_work)
 TEST_DECLARE   (threadpool_cancel_fs)
 TEST_DECLARE   (threadpool_cancel_single)
 TEST_DECLARE   (thread_local_storage)
+TEST_DECLARE   (thread_stack_size)
 TEST_DECLARE   (thread_mutex)
 TEST_DECLARE   (thread_rwlock)
 TEST_DECLARE   (thread_rwlock_trylock)
@@ -717,6 +718,7 @@ TASK_LIST_START
   TEST_ENTRY  (threadpool_cancel_fs)
   TEST_ENTRY  (threadpool_cancel_single)
   TEST_ENTRY  (thread_local_storage)
+  TEST_ENTRY  (thread_stack_size)
   TEST_ENTRY  (thread_mutex)
   TEST_ENTRY  (thread_rwlock)
   TEST_ENTRY  (thread_rwlock_trylock)

test/test-thread.c

@@ -209,3 +209,24 @@ TEST_IMPL(thread_local_storage) {
   uv_key_delete(&tls_key);
   return 0;
 }
+
+
+#if defined(__APPLE__)
+static void thread_check_stack(void* arg) {
+  /* 512KB is the default stack size of threads other than the main thread
+   * on OSX. */
+  ASSERT(pthread_get_stacksize_np(pthread_self()) > 512*1024);
+}
+#endif
+
+
+TEST_IMPL(thread_stack_size) {
+#if defined(__APPLE__)
+  uv_thread_t thread;
+  ASSERT(0 == uv_thread_create(&thread, thread_check_stack, NULL));
+  ASSERT(0 == uv_thread_join(&thread));
+  return 0;
+#else
+  RETURN_SKIP("OSX only test");
+#endif
+}