1 files changed, 71 insertions, 0 deletions
diff --git a/mozglue/misc/PlatformConditionVariable.h b/mozglue/misc/PlatformConditionVariable.h
new file mode 100644
index 0000000000..61fb06ade1
--- /dev/null
+++ b/mozglue/misc/PlatformConditionVariable.h
@@ -0,0 +1,71 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_ConditionVariable_h
+#define mozilla_ConditionVariable_h
+
+#include <stdint.h>
+
+#include <utility>
+
+#include "mozilla/Attributes.h"
+#include "mozilla/PlatformMutex.h"
+#include "mozilla/TimeStamp.h"
+#if !defined(XP_WIN) && !defined(__wasi__)
+#  include <pthread.h>
+#endif
+
+namespace mozilla {
+
+enum class CVStatus { NoTimeout, Timeout };
+
+namespace detail {
+
+class ConditionVariableImpl {
+ public:
+  struct PlatformData;
+
+  MFBT_API ConditionVariableImpl();
+  MFBT_API ~ConditionVariableImpl();
+
+  // Wake one thread that is waiting on this condition.
+  MFBT_API void notify_one();
+
+  // Wake all threads that are waiting on this condition.
+  MFBT_API void notify_all();
+
+  // Atomically release |lock| and sleep the current thread of execution on
+  // this condition variable.
+  // |lock| will be re-acquired before this function returns.
+  // The thread may be woken from sleep from another thread via notify_one()
+  // or notify_all(), but may also wake spuriously.  The caller should recheck
+  // its predicate after this function returns, typically in a while loop.
+  MFBT_API void wait(MutexImpl& lock);
+
+  MFBT_API CVStatus wait_for(MutexImpl& lock,
+                             const mozilla::TimeDuration& rel_time);
+
+ private:
+  ConditionVariableImpl(const ConditionVariableImpl&) = delete;
+  ConditionVariableImpl& operator=(const ConditionVariableImpl&) = delete;
+
+  PlatformData* platformData();
+
+#if !defined(XP_WIN) && !defined(__wasi__)
+  void* platformData_[sizeof(pthread_cond_t) / sizeof(void*)];
+  static_assert(sizeof(pthread_cond_t) / sizeof(void*) != 0 &&
+                    sizeof(pthread_cond_t) % sizeof(void*) == 0,
+                "pthread_cond_t must have pointer alignment");
+#else
+  void* platformData_[4];
+#endif
+};
+
+}  // namespace detail
+
+}  // namespace mozilla
+
+#endif  // mozilla_ConditionVariable_h