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/* CFLocking.h
Copyright (c) 1998-2018, Apple Inc. and the Swift project authors
Portions Copyright (c) 2014-2018, Apple Inc. and the Swift project authors
Licensed under Apache License v2.0 with Runtime Library Exception
See http://swift.org/LICENSE.txt for license information
See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
*/
/*
NOT TO BE USED OUTSIDE CF!
*/
#if !defined(__COREFOUNDATION_CFLOCKING_H__)
#define __COREFOUNDATION_CFLOCKING_H__ 1
#include "CFTargetConditionals.h"
#if TARGET_OS_MAC
#include <pthread.h>
typedef pthread_mutex_t CFLock_t;
#define CFLockInit ((pthread_mutex_t)PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
#define CF_LOCK_INIT_FOR_STRUCTS(X) (X = CFLockInit)
#define __CFLock(LP) ({ (void)pthread_mutex_lock(LP); })
#define __CFUnlock(LP) ({ (void)pthread_mutex_unlock(LP); })
#define __CFLockTry(LP) ({ pthread_mutex_trylock(LP) == 0; })
// SPI to permit initialization of values in Swift
static inline CFLock_t __CFLockInit(void) { return CFLockInit; }
#elif TARGET_OS_WIN32
#define NOMINMAX
#define VC_EXTRALEAN
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#include <synchapi.h>
typedef int32_t CFLock_t;
#define CFLockInit 0
#define CF_LOCK_INIT_FOR_STRUCTS(X) (X = CFLockInit)
CF_INLINE void __CFLock(volatile CFLock_t *lock) {
while (InterlockedCompareExchange((long volatile *)lock, ~0, 0) != 0) {
Sleep(0);
}
}
CF_INLINE void __CFUnlock(volatile CFLock_t *lock) {
MemoryBarrier();
*lock = 0;
}
CF_INLINE Boolean __CFLockTry(volatile CFLock_t *lock) {
return (InterlockedCompareExchange((long volatile *)lock, ~0, 0) == 0);
}
// SPI to permit initialization of values in Swift
static inline CFLock_t __CFLockInit(void) { return CFLockInit; }
#elif TARGET_OS_LINUX || TARGET_OS_BSD
#include <stdint.h>
#include <unistd.h>
typedef int32_t CFLock_t;
#define CFLockInit 0
#define CF_LOCK_INIT_FOR_STRUCTS(X) (X = CFLockInit)
CF_INLINE void __CFLock(volatile CFLock_t *lock) {
while (__sync_val_compare_and_swap(lock, 0, ~0) != 0) {
sleep(0);
}
}
CF_INLINE void __CFUnlock(volatile CFLock_t *lock) {
__sync_synchronize();
*lock = 0;
}
CF_INLINE Boolean __CFLockTry(volatile CFLock_t *lock) {
return (__sync_val_compare_and_swap(lock, 0, ~0) == 0);
}
// SPI to permit initialization of values in Swift
static inline CFLock_t __CFLockInit(void) { return CFLockInit; }
typedef CFLock_t OSSpinLock;
#define OS_SPINLOCK_INIT CFLockInit
#define OSSpinLockLock(lock) __CFLock(lock)
#define OSSpinLockUnlock(lock) __CFUnlock(lock)
#elif TARGET_OS_WASI
// Empty shims until https://bugs.swift.org/browse/SR-12097 is resolved.
typedef int32_t CFLock_t;
typedef CFLock_t OSSpinLock;
#define CFLockInit 0
#define CF_LOCK_INIT_FOR_STRUCTS(X) (X = CFLockInit)
#define OS_SPINLOCK_INIT CFLockInit
#define OSSpinLockLock(lock) __CFLock(lock)
#define OSSpinLockUnlock(lock) __CFUnlock(lock)
#define __CFLock(A) do {} while (0)
#define __CFUnlock(A) do {} while (0)
static inline CFLock_t __CFLockInit(void) { return CFLockInit; }
#else
#warning CF locks not defined for this platform -- CF is not thread-safe
#define __CFLock(A) do {} while (0)
#define __CFUnlock(A) do {} while (0)
#endif
#endif
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