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