win32/win32thread.h

   1 #ifndef _WIN32THREAD_H
   2 #define _WIN32THREAD_H
   3 typedef struct win32_cond { LONG waiters; HANDLE sem; } perl_cond;
   4 typedef DWORD perl_key;
   5 typedef HANDLE perl_thread;
   6
   7 #ifndef DONT_USE_CRITICAL_SECTION
   8
   9 /* Critical Sections used instead of mutexes: lightweight,
  10  * but can't be communicated to child processes, and can't get
  11  * HANDLE to it for use elsewhere.
  12  */
  13 typedef CRITICAL_SECTION perl_mutex;
  14 #define MUTEX_INIT(m) InitializeCriticalSection(m)
  15 #define MUTEX_LOCK(m) EnterCriticalSection(m)
  16 #define MUTEX_UNLOCK(m) LeaveCriticalSection(m)
  17 #define MUTEX_DESTROY(m) DeleteCriticalSection(m)
  18
  19 #else
  20
  21 typedef HANDLE perl_mutex;
  22 #define MUTEX_INIT(m) \
  23     STMT_START {                                                \
  24         if ((*(m) = CreateMutex(NULL,FALSE,NULL)) == NULL)      \
  25             croak("panic: MUTEX_INIT");                         \
  26     } STMT_END
  27 #define MUTEX_LOCK(m) \
  28     STMT_START {                                                \
  29         if (WaitForSingleObject(*(m),INFINITE) == WAIT_FAILED)  \
  30             croak("panic: MUTEX_LOCK");                         \
  31     } STMT_END
  32 #define MUTEX_UNLOCK(m) \
  33     STMT_START {                                                \
  34         if (ReleaseMutex(*(m)) == 0)                            \
  35             croak("panic: MUTEX_UNLOCK");                       \
  36     } STMT_END
  37 #define MUTEX_DESTROY(m) \
  38     STMT_START {                                                \
  39         if (CloseHandle(*(m)) == 0)                             \
  40             croak("panic: MUTEX_DESTROY");                      \
  41     } STMT_END
  42
  43 #endif
  44
  45 /* These macros assume that the mutex associated with the condition
  46  * will always be held before COND_{SIGNAL,BROADCAST,WAIT,DESTROY},
  47  * so there's no separate mutex protecting access to (c)->waiters
  48  */
  49 #define COND_INIT(c) \
  50     STMT_START {                                                \
  51         (c)->waiters = 0;                                       \
  52         (c)->sem = CreateSemaphore(NULL,0,LONG_MAX,NULL);       \
  53         if ((c)->sem == NULL)                                   \
  54             croak("panic: COND_INIT (%ld)",GetLastError());     \
  55     } STMT_END
  56
  57 #define COND_SIGNAL(c) \
  58     STMT_START {                                                \
  59         if ((c)->waiters > 0 &&                                 \
  60             ReleaseSemaphore((c)->sem,1,NULL) == 0)             \
  61             croak("panic: COND_SIGNAL (%ld)",GetLastError());   \
  62     } STMT_END
  63
  64 #define COND_BROADCAST(c) \
  65     STMT_START {                                                \
  66         if ((c)->waiters > 0 &&                                 \
  67             ReleaseSemaphore((c)->sem,(c)->waiters,NULL) == 0)  \
  68             croak("panic: COND_BROADCAST (%ld)",GetLastError());\
  69     } STMT_END
  70
  71 #define COND_WAIT(c, m) \
  72     STMT_START {                                                \
  73         (c)->waiters++;                                         \
  74         MUTEX_UNLOCK(m);                                        \
  75         /* Note that there's no race here, since a              \
  76          * COND_BROADCAST() on another thread will have seen the\
  77          * right number of waiters (i.e. including this one) */ \
  78         if (WaitForSingleObject((c)->sem,INFINITE)==WAIT_FAILED)\
  79             croak("panic: COND_WAIT (%ld)",GetLastError());     \
  80         /* XXX there may be an inconsequential race here */     \
  81         MUTEX_LOCK(m);                                          \
  82         (c)->waiters--;                                         \
  83     } STMT_END
  84
  85 #define COND_DESTROY(c) \
  86     STMT_START {                                                \
  87         (c)->waiters = 0;                                       \
  88         if (CloseHandle((c)->sem) == 0)                         \
  89             croak("panic: COND_DESTROY (%ld)",GetLastError());  \
  90     } STMT_END
  91
  92 #define DETACH(t) \
  93     STMT_START {                                                \
  94         if (CloseHandle((t)->self) == 0) {                      \
  95             MUTEX_UNLOCK(&(t)->mutex);                          \
  96             croak("panic: DETACH");                             \
  97         }                                                       \
  98     } STMT_END
  99
 100
 101 #define THREAD_CREATE(t, f)     Perl_thread_create(t, f)
 102 #define THREAD_POST_CREATE(t)   NOOP
 103 #define THREAD_RET_TYPE         DWORD WINAPI
 104 #define THREAD_RET_CAST(p)      ((DWORD)(p))
 105
 106 typedef THREAD_RET_TYPE thread_func_t(void *);
 107
 108
 109 START_EXTERN_C
 110
 111 #if defined(PERLDLL) && defined(_DLL)
 112 extern __declspec(thread) struct thread *Perl_current_thread;
 113 #define SET_THR(t)              (Perl_current_thread = t)
 114 #define THR                     Perl_current_thread
 115 #else
 116 #define THR                     Perl_getTHR()
 117 #define SET_THR(t)              Perl_setTHR(t)
 118 #endif
 119
 120 void Perl_alloc_thread_key _((void));
 121 int Perl_thread_create _((struct thread *thr, thread_func_t *fn));
 122 void Perl_set_thread_self _((struct thread *thr));
 123 struct thread *Perl_getTHR _((void));
 124 void Perl_setTHR _((struct thread *t));
 125
 126 END_EXTERN_C
 127
 128 #define INIT_THREADS NOOP
 129 #define ALLOC_THREAD_KEY NOOP
 130 #define SET_THREAD_SELF(thr) Perl_set_thread_self(thr)
 131
 132 #define JOIN(t, avp)                                                    \
 133     STMT_START {                                                        \
 134         if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED)    \
 135              || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0))     \
 136             croak("panic: JOIN");                                       \
 137     } STMT_END
 138
 139 #define YIELD                   Sleep(0)
 140
 141 #endif /* _WIN32THREAD_H */
 142