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lock.h
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#ifndef LOCK_H
#define LOCK_H
#ifdef _WIN32
#include <windows.h>
#include <pthread.h>
#else
#include <sched.h>
#endif
#include "head.h"
#ifdef _WIN32
#define lock_cancel()
#else
#define lock_cancel() pthread_testcancel()
#endif
#ifdef _WIN32
#define lock_yield() SwitchToThread()
#else
#define lock_yield() sched_yield()
#endif
#define lock(...) __VA_FUNC__(lock, __VA_ARGS__)
#define lock_1(__lock) \
({ \
while(!trylock(__lock)) \
lock_yield(); \
})
#define lock_2(__lock, __cond) \
({ \
int __ret = TRUE; \
while(1) \
{ \
lock_cancel(); \
if(trylock(__lock)) \
{ \
if(__cond) \
break; \
unlock(__lock); \
} \
lock_yield(); \
} \
__ret; \
})
/*
第一个参数为锁,不用取地址,第二个参数为判断条件,没有填TRUE,第三个参数为超时时间,不设置超时填-1
当关闭线程时,被关闭的线程在加锁状态中,不会被关闭,但使用的资源已经被释放,因此造成段错误
t=0时,相当于trylock
*/
#define lock_3(__lock, __cond, __time) \
({ \
int __ret = TRUE; \
struct timeval __tv1, __tv2; \
gettimeofday(&__tv1, NULL); \
while(1) \
{ \
lock_cancel(); \
if(trylock(__lock)) \
{ \
if(__cond) \
break; \
unlock(__lock); \
} \
lock_yield(); \
if(__time >= 0) \
{ \
gettimeofday(&__tv2, NULL); \
if((__tv2.tv_sec - __tv1.tv_sec) S + (__tv2.tv_usec - __tv1.tv_usec) > __time) \
{ \
__ret = FALSE; \
break; \
} \
} \
} \
__ret; \
})
#define trylock(__lock) \
({ \
__sync_bool_compare_and_swap(&(__lock), 0, 1); \
})
#define unlock(__lock) \
({ \
__sync_lock_release(&(__lock)); \
})
#define with_lock(__lock, __body) \
({ \
typeof((__body)) __result; \
lock(__lock); \
__result = (__body); \
unlock(__lock); \
__result; \
})
//读写锁
typedef struct rwlock
{
unsigned char disable;
unsigned char rl;
unsigned char wl;
unsigned char rwl;
unsigned short rc;
unsigned short wc;
} rwlock;
#define rlock(__lock) \
({ \
if(((rwlock *)(&__lock))->disable == 0) \
{ \
lock(((rwlock *)(&__lock))->rl); \
if(__sync_fetch_and_add(&((rwlock *)(&__lock))->rc, 1) == 0) \
lock(((rwlock *)(&__lock))->rwl); \
unlock(((rwlock *)(&__lock))->rl); \
} \
})
#define runlock(__lock) \
({ \
if(((rwlock *)(&__lock))->disable == 0) \
{ \
lock(((rwlock *)(&__lock))->rl); \
if(__sync_fetch_and_sub(&((rwlock *)(&__lock))->rc, 1) == 1) \
unlock(((rwlock *)(&__lock))->rwl); \
unlock(((rwlock *)(&__lock))->rl); \
} \
})
#define wlock(__lock) \
({ \
if(((rwlock *)(&__lock))->disable == 0) \
{ \
lock(((rwlock *)(&__lock))->wl); \
if(__sync_fetch_and_add(&((rwlock *)(&__lock))->wc, 1) == 0) \
lock(((rwlock *)(&__lock))->rl); \
unlock(((rwlock *)(&__lock))->wl); \
lock(((rwlock *)(&__lock))->rwl); \
} \
})
#define wunlock(__lock) \
({ \
if(((rwlock *)(&__lock))->disable == 0) \
{ \
unlock(((rwlock *)(&__lock))->rwl); \
lock(((rwlock *)(&__lock))->wl); \
if(__sync_fetch_and_sub(&((rwlock *)(&__lock))->wc, 1) == 1) \
unlock(((rwlock *)(&__lock))->rl); \
unlock(((rwlock *)(&__lock))->wl); \
} \
})
#define with_rlock(__lock, __body) \
({ \
typeof((__body)) __result; \
rlock(__lock); \
__result = (__body); \
runlock(__lock); \
__result; \
})
#define with_wlock(__lock, __body) \
({ \
typeof((__body)) __result; \
wlock(__lock); \
__result = (__body); \
wunlock(__lock); \
__result; \
})
//禁用锁,在结构的遍历中使用
#define disable_rwlock(__lock, __body) \
({ \
typeof((__body)) __result; \
((rwlock *)(&__lock))->disable = 1; \
__result = (__body); \
((rwlock *)(&__lock))->disable = 0; \
__result; \
})
#endif