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mmap portability layer, mmap for Windows

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new macro: thread_safe_decrement, thread_safe_dec_and_test, statistic_decrement


mysys/my_chsize.c:
  cleanup
include/config-win.h:
  mmap portability layer, mmap for Windows
include/my_pthread.h:
  thread_safe_decrement, thread_safe_dec_and_test, statistic_decrement
include/my_sys.h:
  mmap portability layer, mmap for Windows
mysys/Makefile.am:
  mmap portability layer, mmap for Windows
This commit is contained in:
unknown
2004-11-04 22:55:47 +01:00
parent fac533bb14
commit cce44b148c
6 changed files with 148 additions and 14 deletions
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32
include/my_pthread.h
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@ -674,21 +674,43 @@ extern pthread_t shutdown_th, main_th, signal_th;
#ifndef thread_safe_increment
#ifdef HAVE_ATOMIC_ADD
#define thread_safe_increment(V,L) atomic_add(1,(atomic_t*) &V);
#define thread_safe_increment(V,L) atomic_inc((atomic_t*) &V);
#define thread_safe_decrement(V,L) atomic_dec((atomic_t*) &V);
#define thread_safe_dec_and_test(V, L) atomic_dec_and_test((atomic_t*) &V);
#define thread_safe_add(V,C,L) atomic_add((C),(atomic_t*) &V);
#define thread_safe_sub(V,C,L) atomic_sub((C),(atomic_t*) &V);
#else
#define thread_safe_increment(V,L) \
pthread_mutex_lock((L)); (V)++; pthread_mutex_unlock((L));
#define thread_safe_add(V,C,L) \
pthread_mutex_lock((L)); (V)+=(C); pthread_mutex_unlock((L));
(pthread_mutex_lock((L)), (V)++, pthread_mutex_unlock((L)))
#define thread_safe_decrement(V,L) \
(pthread_mutex_lock((L)), (V)--, pthread_mutex_unlock((L)))
#define thread_safe_add(V,C,L) (pthread_mutex_lock((L)), (V)+=(C), pthread_mutex_unlock((L)))
#define thread_safe_sub(V,C,L) \
pthread_mutex_lock((L)); (V)-=(C); pthread_mutex_unlock((L));
(pthread_mutex_lock((L)), (V)-=(C), pthread_mutex_unlock((L)))
#if defined (__GNUC__) || defined (__cplusplus)
static inline bool thread_safe_dec_and_test(ulong V, pthread_mutex_t *L)
{
ulong res;
pthread_mutex_lock(L);
res=V--;
pthread_mutex_unlock(L);
return res==0;
}
#else
/*
what should we do ? define it as static ?
a regular function somewhere in mysys/ ?
for now it's only used in c++ code, so there's no need to bother
*/
#warning "No thread_safe_dec_and_test() for this architecture"
#endif
#endif /* HAVE_ATOMIC_ADD */
#ifdef SAFE_STATISTICS
#define statistic_increment(V,L) thread_safe_increment((V),(L))
#define statistic_decrement(V,L) thread_safe_decrement((V),(L))
#define statistic_add(V,C,L) thread_safe_add((V),(C),(L))
#else
#define statistic_decrement(V,L) (V)--
#define statistic_increment(V,L) (V)++
#define statistic_add(V,C,L) (V)+=(C)
#endif /* SAFE_STATISTICS */