deps: upgrade libuv to b9ed1a6

1 files changed, 246 insertions, 1 deletions

diff --git a/deps/uv/src/win/thread.c b/deps/uv/src/win/thread.c
index cb2ba4ec61..da6138ad7d 100644
--- a/deps/uv/src/win/thread.c
+++ b/deps/uv/src/win/thread.c
@@ -27,6 +27,7 @@
 
 
 #define HAVE_SRWLOCK_API() (pTryAcquireSRWLockShared != NULL)
+#define HAVE_CONDVAR_API() (pInitializeConditionVariable != NULL)
 
 #ifdef _MSC_VER /* msvc */
 # define inline __inline
@@ -56,6 +57,23 @@ inline static int uv__rwlock_fallback_trywrlock(uv_rwlock_t* rwlock);
 inline static void uv__rwlock_fallback_wrunlock(uv_rwlock_t* rwlock);
 
 
+inline static int uv_cond_fallback_init(uv_cond_t* cond);
+inline static void uv_cond_fallback_destroy(uv_cond_t* cond);
+inline static void uv_cond_fallback_signal(uv_cond_t* cond);
+inline static void uv_cond_fallback_broadcast(uv_cond_t* cond);
+inline static void uv_cond_fallback_wait(uv_cond_t* cond, uv_mutex_t* mutex);
+inline static int uv_cond_fallback_timedwait(uv_cond_t* cond,
+    uv_mutex_t* mutex, uint64_t timeout);
+
+inline static int uv_cond_condvar_init(uv_cond_t* cond);
+inline static void uv_cond_condvar_destroy(uv_cond_t* cond);
+inline static void uv_cond_condvar_signal(uv_cond_t* cond);
+inline static void uv_cond_condvar_broadcast(uv_cond_t* cond);
+inline static void uv_cond_condvar_wait(uv_cond_t* cond, uv_mutex_t* mutex);
+inline static int uv_cond_condvar_timedwait(uv_cond_t* cond,
+    uv_mutex_t* mutex, uint64_t timeout);
+
+
 static NOINLINE void uv__once_inner(uv_once_t* guard,
     void (*callback)(void)) {
   DWORD result;
@@ -81,7 +99,7 @@ static NOINLINE void uv__once_inner(uv_once_t* guard,
 
   } else {
     /* We lost the race. Destroy the event we created and wait for the */
-    /* existing one to become signaled. */
+    /* existing one todv become signaled. */
     CloseHandle(created_event);
     result = WaitForSingleObject(existing_event, INFINITE);
     assert(result == WAIT_OBJECT_0);
@@ -140,6 +158,8 @@ void uv_mutex_unlock(uv_mutex_t* mutex) {
 
 
 int uv_rwlock_init(uv_rwlock_t* rwlock) {
+  uv__once_init();
+
   if (HAVE_SRWLOCK_API())
     return uv__rwlock_srwlock_init(rwlock);
   else
@@ -365,3 +385,228 @@ inline static int uv__rwlock_fallback_trywrlock(uv_rwlock_t* rwlock) {
 inline static void uv__rwlock_fallback_wrunlock(uv_rwlock_t* rwlock) {
   uv_mutex_unlock(&rwlock->fallback_.write_mutex_);
 }
+
+
+
+/* This condition variable implementation is based on the SetEvent solution
+ * (section 3.2) at http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
+ * We could not use the SignalObjectAndWait solution (section 3.4) because
+ * it want the 2nd argument (type uv_mutex_t) of uv_cond_wait() and
+ * uv_cond_timedwait() to be HANDLEs, but we use CRITICAL_SECTIONs.
+ */
+
+inline static int uv_cond_fallback_init(uv_cond_t* cond) {
+  /* Initialize the count to 0. */
+  cond->fallback.waiters_count = 0;
+
+  InitializeCriticalSection(&cond->fallback.waiters_count_lock);
+
+  /* Create an auto-reset event. */
+  cond->fallback.signal_event = CreateEvent(NULL,  /* no security */
+                                            FALSE, /* auto-reset event */
+                                            FALSE, /* non-signaled initially */
+                                            NULL); /* unnamed */
+  if (!cond->fallback.signal_event)
+    goto error2;
+
+  /* Create a manual-reset event. */
+  cond->fallback.broadcast_event = CreateEvent(NULL,  /* no security */
+                                               TRUE,  /* manual-reset */
+                                               FALSE, /* non-signaled */
+                                               NULL); /* unnamed */
+  if (!cond->fallback.broadcast_event)
+    goto error;
+
+  return 0;
+
+error:
+  CloseHandle(cond->fallback.signal_event);
+error2:
+  DeleteCriticalSection(&cond->fallback.waiters_count_lock);
+  return -1;
+}
+
+
+inline static int uv_cond_condvar_init(uv_cond_t* cond) {
+  pInitializeConditionVariable(&cond->cond_var);
+  return 0;
+}
+
+
+int uv_cond_init(uv_cond_t* cond) {
+  uv__once_init();
+
+  if (HAVE_CONDVAR_API())
+    return uv_cond_condvar_init(cond);
+  else
+    return uv_cond_fallback_init(cond);
+}
+
+
+inline static void uv_cond_fallback_destroy(uv_cond_t* cond) {
+  if (!CloseHandle(cond->fallback.broadcast_event))
+    abort();
+  if (!CloseHandle(cond->fallback.signal_event))
+    abort();
+  DeleteCriticalSection(&cond->fallback.waiters_count_lock);
+}
+
+
+inline static void uv_cond_condvar_destroy(uv_cond_t* cond) {
+  /* nothing to do */
+}
+
+
+void uv_cond_destroy(uv_cond_t* cond) {
+  if (HAVE_CONDVAR_API())
+    uv_cond_condvar_destroy(cond);
+  else
+    uv_cond_fallback_destroy(cond);
+}
+
+
+inline static void uv_cond_fallback_signal(uv_cond_t* cond) {
+  int have_waiters;
+
+  /* Avoid race conditions. */
+  EnterCriticalSection(&cond->fallback.waiters_count_lock);
+  have_waiters = cond->fallback.waiters_count > 0;
+  LeaveCriticalSection(&cond->fallback.waiters_count_lock);
+
+  if (have_waiters)
+    SetEvent(cond->fallback.signal_event);
+}
+
+
+inline static void uv_cond_condvar_signal(uv_cond_t* cond) {
+  pWakeConditionVariable(&cond->cond_var);
+}
+
+
+void uv_cond_signal(uv_cond_t* cond) {
+  if (HAVE_CONDVAR_API())
+    uv_cond_condvar_signal(cond);
+  else
+    uv_cond_fallback_signal(cond);
+}
+
+
+inline static void uv_cond_fallback_broadcast(uv_cond_t* cond) {
+  int have_waiters;
+
+  /* Avoid race conditions. */
+  EnterCriticalSection(&cond->fallback.waiters_count_lock);
+  have_waiters = cond->fallback.waiters_count > 0;
+  LeaveCriticalSection(&cond->fallback.waiters_count_lock);
+
+  if (have_waiters)
+    SetEvent(cond->fallback.broadcast_event);
+}
+
+
+inline static void uv_cond_condvar_broadcast(uv_cond_t* cond) {
+  pWakeAllConditionVariable(&cond->cond_var);
+}
+
+
+void uv_cond_broadcast(uv_cond_t* cond) {
+  if (HAVE_CONDVAR_API())
+    uv_cond_condvar_broadcast(cond);
+  else
+    uv_cond_fallback_broadcast(cond);
+}
+
+
+inline int uv_cond_wait_helper(uv_cond_t* cond, uv_mutex_t* mutex,
+    DWORD dwMilliseconds) {
+  DWORD result;
+  int last_waiter;
+  HANDLE handles[2] = {
+    cond->fallback.signal_event,
+    cond->fallback.broadcast_event
+  };
+
+  /* Avoid race conditions. */
+  EnterCriticalSection(&cond->fallback.waiters_count_lock);
+  cond->fallback.waiters_count++;
+  LeaveCriticalSection(&cond->fallback.waiters_count_lock);
+
+  /* It's ok to release the <mutex> here since Win32 manual-reset events */
+  /* maintain state when used with <SetEvent>. This avoids the "lost wakeup" */
+  /* bug. */
+  uv_mutex_unlock(mutex);
+
+  /* Wait for either event to become signaled due to <uv_cond_signal> being */
+  /* called or <uv_cond_broadcast> being called. */
+  result = WaitForMultipleObjects(2, handles, FALSE, dwMilliseconds);
+
+  EnterCriticalSection(&cond->fallback.waiters_count_lock);
+  cond->fallback.waiters_count--;
+  last_waiter = result == WAIT_OBJECT_0 + 1
+      && cond->fallback.waiters_count == 0;
+  LeaveCriticalSection(&cond->fallback.waiters_count_lock);
+
+  /* Some thread called <pthread_cond_broadcast>. */
+  if (last_waiter) {
+    /* We're the last waiter to be notified or to stop waiting, so reset the */
+    /* the manual-reset event. */
+    ResetEvent(cond->fallback.broadcast_event);
+  }
+
+  /* Reacquire the <mutex>. */
+  uv_mutex_lock(mutex);
+
+  if (result == WAIT_OBJECT_0 || result == WAIT_OBJECT_0 + 1)
+    return 0;
+
+  if (result == WAIT_TIMEOUT)
+    return -1;
+
+  abort();
+  return -1; /* Satisfy the compiler. */
+}
+
+
+inline static void uv_cond_fallback_wait(uv_cond_t* cond, uv_mutex_t* mutex) {
+  if (uv_cond_wait_helper(cond, mutex, INFINITE))
+    abort();
+}
+
+
+inline static void uv_cond_condvar_wait(uv_cond_t* cond, uv_mutex_t* mutex) {
+  if (!pSleepConditionVariableCS(&cond->cond_var, mutex, INFINITE))
+    abort();
+}
+
+
+void uv_cond_wait(uv_cond_t* cond, uv_mutex_t* mutex) {
+  if (HAVE_CONDVAR_API())
+    uv_cond_condvar_wait(cond, mutex);
+  else
+    uv_cond_fallback_wait(cond, mutex);
+}
+
+
+inline static int uv_cond_fallback_timedwait(uv_cond_t* cond,
+    uv_mutex_t* mutex, uint64_t timeout) {
+  return uv_cond_wait_helper(cond, mutex, (DWORD)(timeout / 1e6));
+}
+
+
+inline static int uv_cond_condvar_timedwait(uv_cond_t* cond,
+    uv_mutex_t* mutex, uint64_t timeout) {
+  if (pSleepConditionVariableCS(&cond->cond_var, mutex, (DWORD)(timeout / 1e6)))
+    return 0;
+  if (GetLastError() != ERROR_TIMEOUT)
+    abort();
+  return -1;
+}
+
+
+int uv_cond_timedwait(uv_cond_t* cond, uv_mutex_t* mutex,
+    uint64_t timeout) {
+  if (HAVE_CONDVAR_API())
+    return uv_cond_condvar_timedwait(cond, mutex, timeout);
+  else
+    return uv_cond_fallback_timedwait(cond, mutex, timeout);
+}