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//===--- MutexWin32.h - -----------------------------------------*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// Mutex, ConditionVariable, Read/Write lock, and Scoped lock implementations
// using Windows Slim Reader/Writer Locks and Conditional Variables.
//
//===----------------------------------------------------------------------===//
#ifndef SWIFT_RUNTIME_MUTEX_WIN32_BACKDEPLOY56_H
#define SWIFT_RUNTIME_MUTEX_WIN32_BACKDEPLOY56_H
#define WIN32_LEAN_AND_MEAN
#define NOMINMAX
#include <windows.h>
namespace swift {
typedef CONDITION_VARIABLE ConditionHandle;
typedef SRWLOCK ConditionMutexHandle;
typedef SRWLOCK MutexHandle;
typedef SRWLOCK ReadWriteLockHandle;
#define SWIFT_CONDITION_SUPPORTS_CONSTEXPR 1
#define SWIFT_MUTEX_SUPPORTS_CONSTEXPR 1
#define SWIFT_READWRITELOCK_SUPPORTS_CONSTEXPR 1
struct ConditionPlatformHelper {
static constexpr ConditionHandle staticInit() {
return CONDITION_VARIABLE_INIT;
};
static void init(ConditionHandle &condition) {
InitializeConditionVariable(&condition);
}
static void destroy(ConditionHandle &condition) {}
static void notifyOne(ConditionHandle &condition) {
WakeConditionVariable(&condition);
}
static void notifyAll(ConditionHandle &condition) {
WakeAllConditionVariable(&condition);
}
static void wait(ConditionHandle &condition, MutexHandle &mutex);
};
struct MutexPlatformHelper {
static constexpr MutexHandle staticInit() { return SRWLOCK_INIT; }
static constexpr ConditionMutexHandle conditionStaticInit() {
return SRWLOCK_INIT;
}
static void init(MutexHandle &mutex, bool checked = false) {
InitializeSRWLock(&mutex);
}
static void destroy(MutexHandle &mutex) {}
static void lock(MutexHandle &mutex) { AcquireSRWLockExclusive(&mutex); }
static void unlock(MutexHandle &mutex) { ReleaseSRWLockExclusive(&mutex); }
static bool try_lock(MutexHandle &mutex) {
return TryAcquireSRWLockExclusive(&mutex) != 0;
}
// The unsafe versions don't do error checking.
static void unsafeLock(MutexHandle &mutex) {
AcquireSRWLockExclusive(&mutex);
}
static void unsafeUnlock(MutexHandle &mutex) {
ReleaseSRWLockExclusive(&mutex);
}
};
struct ReadWriteLockPlatformHelper {
static constexpr ReadWriteLockHandle staticInit() { return SRWLOCK_INIT; }
static void init(ReadWriteLockHandle &rwlock) { InitializeSRWLock(&rwlock); }
static void destroy(ReadWriteLockHandle &rwlock) {}
static void readLock(ReadWriteLockHandle &rwlock) {
AcquireSRWLockShared(&rwlock);
}
static bool try_readLock(ReadWriteLockHandle &rwlock) {
return TryAcquireSRWLockShared(&rwlock) != 0;
}
static void readUnlock(ReadWriteLockHandle &rwlock) {
ReleaseSRWLockShared(&rwlock);
}
static void writeLock(ReadWriteLockHandle &rwlock) {
AcquireSRWLockExclusive(&rwlock);
}
static bool try_writeLock(ReadWriteLockHandle &rwlock) {
return TryAcquireSRWLockExclusive(&rwlock) != 0;
}
static void writeUnlock(ReadWriteLockHandle &rwlock) {
ReleaseSRWLockExclusive(&rwlock);
}
};
}
#endif // SWIFT_RUNTIME_MUTEX_WIN32_BACKDEPLOY56_H
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