compat/win32/pthread.h

   1 /*
   2  * Header used to adapt pthread-based POSIX code to Windows API threads.
   3  *
   4  * Copyright (C) 2009 Andrzej K. Haczewski <ahaczewski@gmail.com>
   5  */
   6
   7 #ifndef PTHREAD_H
   8 #define PTHREAD_H
   9
  10 #ifndef WIN32_LEAN_AND_MEAN
  11 #define WIN32_LEAN_AND_MEAN
  12 #endif
  13
  14 #include <windows.h>
  15
  16 /*
  17  * Defines that adapt Windows API threads to pthreads API
  18  */
  19 #define pthread_mutex_t CRITICAL_SECTION
  20
  21 static inline int return_0(int i) {
  22         return 0;
  23 }
  24 #define pthread_mutex_init(a,b) return_0((InitializeCriticalSection((a)), 0))
  25 #define pthread_mutex_destroy(a) DeleteCriticalSection((a))
  26 #define pthread_mutex_lock EnterCriticalSection
  27 #define pthread_mutex_unlock LeaveCriticalSection
  28
  29 typedef int pthread_mutexattr_t;
  30 #define pthread_mutexattr_init(a) (*(a) = 0)
  31 #define pthread_mutexattr_destroy(a) do {} while (0)
  32 #define pthread_mutexattr_settype(a, t) 0
  33 #define PTHREAD_MUTEX_RECURSIVE 0
  34
  35 /*
  36  * Implement simple condition variable for Windows threads, based on ACE
  37  * implementation.
  38  *
  39  * See original implementation: http://bit.ly/1vkDjo
  40  * ACE homepage: http://www.cse.wustl.edu/~schmidt/ACE.html
  41  * See also: http://www.cse.wustl.edu/~schmidt/win32-cv-1.html
  42  */
  43 typedef struct {
  44         LONG waiters;
  45         int was_broadcast;
  46         CRITICAL_SECTION waiters_lock;
  47         HANDLE sema;
  48         HANDLE continue_broadcast;
  49 } pthread_cond_t;
  50
  51 extern int pthread_cond_init(pthread_cond_t *cond, const void *unused);
  52 extern int pthread_cond_destroy(pthread_cond_t *cond);
  53 extern int pthread_cond_wait(pthread_cond_t *cond, CRITICAL_SECTION *mutex);
  54 extern int pthread_cond_signal(pthread_cond_t *cond);
  55 extern int pthread_cond_broadcast(pthread_cond_t *cond);
  56
  57 /*
  58  * Simple thread creation implementation using pthread API
  59  */
  60 typedef struct {
  61         HANDLE handle;
  62         void *(*start_routine)(void*);
  63         void *arg;
  64         DWORD tid;
  65 } pthread_t;
  66
  67 extern int pthread_create(pthread_t *thread, const void *unused,
  68                           void *(*start_routine)(void*), void *arg);
  69
  70 /*
  71  * To avoid the need of copying a struct, we use small macro wrapper to pass
  72  * pointer to win32_pthread_join instead.
  73  */
  74 #define pthread_join(a, b) win32_pthread_join(&(a), (b))
  75
  76 extern int win32_pthread_join(pthread_t *thread, void **value_ptr);
  77
  78 #define pthread_equal(t1, t2) ((t1).tid == (t2).tid)
  79 extern pthread_t pthread_self(void);
  80
  81 static inline int pthread_exit(void *ret)
  82 {
  83         ExitThread((DWORD)(intptr_t)ret);
  84 }
  85
  86 typedef DWORD pthread_key_t;
  87 static inline int pthread_key_create(pthread_key_t *keyp, void (*destructor)(void *value))
  88 {
  89         return (*keyp = TlsAlloc()) == TLS_OUT_OF_INDEXES ? EAGAIN : 0;
  90 }
  91
  92 static inline int pthread_key_delete(pthread_key_t key)
  93 {
  94         return TlsFree(key) ? 0 : EINVAL;
  95 }
  96
  97 static inline int pthread_setspecific(pthread_key_t key, const void *value)
  98 {
  99         return TlsSetValue(key, (void *)value) ? 0 : EINVAL;
 100 }
 101
 102 static inline void *pthread_getspecific(pthread_key_t key)
 103 {
 104         return TlsGetValue(key);
 105 }
 106
 107 #endif /* PTHREAD_H */