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Text File  |  2000-03-15  |  6.5 KB  |  201 lines
  1. #ifndef _WIN32THREAD_H
  2. #define _WIN32THREAD_H
  3.  
  4. #include "win32.h"
  5.  
  6. typedef struct win32_cond { LONG waiters; HANDLE sem; } perl_cond;
  7. typedef DWORD perl_key;
  8. typedef HANDLE perl_os_thread;
  9.  
  10. #ifndef DONT_USE_CRITICAL_SECTION
  11.  
  12. /* Critical Sections used instead of mutexes: lightweight,
  13.  * but can't be communicated to child processes, and can't get
  14.  * HANDLE to it for use elsewhere.
  15.  */
  16. typedef CRITICAL_SECTION perl_mutex;
  17. #define MUTEX_INIT(m) InitializeCriticalSection(m)
  18. #define MUTEX_LOCK(m) EnterCriticalSection(m)
  19. #define MUTEX_UNLOCK(m) LeaveCriticalSection(m)
  20. #define MUTEX_DESTROY(m) DeleteCriticalSection(m)
  21.  
  22. #else
  23.  
  24. typedef HANDLE perl_mutex;
  25. #  define MUTEX_INIT(m) \
  26.     STMT_START {                        \
  27.     if ((*(m) = CreateMutex(NULL,FALSE,NULL)) == NULL)    \
  28.         Perl_croak_nocontext("panic: MUTEX_INIT");        \
  29.     } STMT_END
  30.  
  31. #  define MUTEX_LOCK(m) \
  32.     STMT_START {                        \
  33.     if (WaitForSingleObject(*(m),INFINITE) == WAIT_FAILED)    \
  34.         Perl_croak_nocontext("panic: MUTEX_LOCK");        \
  35.     } STMT_END
  36.  
  37. #  define MUTEX_UNLOCK(m) \
  38.     STMT_START {                        \
  39.     if (ReleaseMutex(*(m)) == 0)                \
  40.         Perl_croak_nocontext("panic: MUTEX_UNLOCK");    \
  41.     } STMT_END
  42.  
  43. #  define MUTEX_DESTROY(m) \
  44.     STMT_START {                        \
  45.     if (CloseHandle(*(m)) == 0)                \
  46.         Perl_croak_nocontext("panic: MUTEX_DESTROY");    \
  47.     } STMT_END
  48.  
  49. #endif
  50.  
  51. /* These macros assume that the mutex associated with the condition
  52.  * will always be held before COND_{SIGNAL,BROADCAST,WAIT,DESTROY},
  53.  * so there's no separate mutex protecting access to (c)->waiters
  54.  */
  55. #define COND_INIT(c) \
  56.     STMT_START {                        \
  57.     (c)->waiters = 0;                    \
  58.     (c)->sem = CreateSemaphore(NULL,0,LONG_MAX,NULL);    \
  59.     if ((c)->sem == NULL)                    \
  60.         Perl_croak_nocontext("panic: COND_INIT (%ld)",GetLastError());    \
  61.     } STMT_END
  62.  
  63. #define COND_SIGNAL(c) \
  64.     STMT_START {                        \
  65.     if ((c)->waiters > 0 &&                    \
  66.         ReleaseSemaphore((c)->sem,1,NULL) == 0)        \
  67.         Perl_croak_nocontext("panic: COND_SIGNAL (%ld)",GetLastError());    \
  68.     } STMT_END
  69.  
  70. #define COND_BROADCAST(c) \
  71.     STMT_START {                        \
  72.     if ((c)->waiters > 0 &&                    \
  73.         ReleaseSemaphore((c)->sem,(c)->waiters,NULL) == 0)    \
  74.         Perl_croak_nocontext("panic: COND_BROADCAST (%ld)",GetLastError());\
  75.     } STMT_END
  76.  
  77. #define COND_WAIT(c, m) \
  78.     STMT_START {                        \
  79.     (c)->waiters++;                        \
  80.     MUTEX_UNLOCK(m);                    \
  81.     /* Note that there's no race here, since a        \
  82.      * COND_BROADCAST() on another thread will have seen the\
  83.      * right number of waiters (i.e. including this one) */    \
  84.     if (WaitForSingleObject((c)->sem,INFINITE)==WAIT_FAILED)\
  85.         Perl_croak_nocontext("panic: COND_WAIT (%ld)",GetLastError());    \
  86.     /* XXX there may be an inconsequential race here */    \
  87.     MUTEX_LOCK(m);                        \
  88.     (c)->waiters--;                        \
  89.     } STMT_END
  90.  
  91. #define COND_DESTROY(c) \
  92.     STMT_START {                        \
  93.     (c)->waiters = 0;                    \
  94.     if (CloseHandle((c)->sem) == 0)                \
  95.         Perl_croak_nocontext("panic: COND_DESTROY (%ld)",GetLastError());    \
  96.     } STMT_END
  97.  
  98. #define DETACH(t) \
  99.     STMT_START {                        \
  100.     if (CloseHandle((t)->self) == 0) {            \
  101.         MUTEX_UNLOCK(&(t)->mutex);                \
  102.         Perl_croak_nocontext("panic: DETACH");        \
  103.     }                            \
  104.     } STMT_END
  105.  
  106.  
  107. #define THREAD_CREATE(t, f)    Perl_thread_create(t, f)
  108. #define THREAD_POST_CREATE(t)    NOOP
  109.  
  110. /* XXX Docs mention that the RTL versions of thread creation routines
  111.  * should be used, but that advice only seems applicable when the RTL
  112.  * is not in a DLL.  RTL DLLs in both Borland and VC seem to do all of
  113.  * the init/deinit required upon DLL_THREAD_ATTACH/DETACH.  So we seem
  114.  * to be completely safe using straight Win32 API calls, rather than
  115.  * the much braindamaged RTL calls.
  116.  *
  117.  * _beginthread() in the RTLs call CloseHandle() just after the thread
  118.  * function returns, which means: 1) we have a race on our hands
  119.  * 2) it is impossible to implement join() semantics.
  120.  *
  121.  * IOW, do *NOT* turn on USE_RTL_THREAD_API!  It is here
  122.  * for experimental purposes only. GSAR 98-01-02
  123.  */
  124. #ifdef USE_RTL_THREAD_API
  125. #  include <process.h>
  126. #  if defined(__BORLANDC__)
  127.      /* Borland RTL doesn't allow a return value from thread function! */
  128. #    define THREAD_RET_TYPE    void _USERENTRY
  129. #    define THREAD_RET_CAST(p)    ((void)(thr->i.retv = (void *)(p)))
  130. #  elif defined (_MSC_VER)
  131. #    define THREAD_RET_TYPE    unsigned __stdcall
  132. #    define THREAD_RET_CAST(p)    ((unsigned)(p))
  133. #  else
  134.      /* CRTDLL.DLL doesn't allow a return value from thread function! */
  135. #    define THREAD_RET_TYPE    void __cdecl
  136. #    define THREAD_RET_CAST(p)    ((void)(thr->i.retv = (void *)(p)))
  137. #  endif
  138. #else    /* !USE_RTL_THREAD_API */
  139. #  define THREAD_RET_TYPE    DWORD WINAPI
  140. #  define THREAD_RET_CAST(p)    ((DWORD)(p))
  141. #endif    /* !USE_RTL_THREAD_API */
  142.  
  143. typedef THREAD_RET_TYPE thread_func_t(void *);
  144.  
  145.  
  146. START_EXTERN_C
  147.  
  148. #if defined(PERLDLL) && defined(USE_DECLSPEC_THREAD) && (!defined(__BORLANDC__) || defined(_DLL))
  149. extern __declspec(thread) void *PL_current_context;
  150. #define PERL_SET_CONTEXT(t)           (PL_current_context = t)
  151. #define PERL_GET_CONTEXT        PL_current_context
  152. #else
  153. #define PERL_GET_CONTEXT        Perl_get_context()
  154. #define PERL_SET_CONTEXT(t)        Perl_set_context(t)
  155. #endif
  156.  
  157. #if defined(USE_THREADS)
  158. struct perl_thread;
  159. int Perl_thread_create (struct perl_thread *thr, thread_func_t *fn);
  160. void Perl_set_thread_self (struct perl_thread *thr);
  161. void Perl_init_thread_intern (struct perl_thread *t);
  162.  
  163. #define SET_THREAD_SELF(thr) Perl_set_thread_self(thr)
  164.  
  165. #endif /* USE_THREADS */
  166.  
  167. END_EXTERN_C
  168.  
  169. #define INIT_THREADS        NOOP
  170. #define ALLOC_THREAD_KEY \
  171.     STMT_START {                            \
  172.     if ((PL_thr_key = TlsAlloc()) == TLS_OUT_OF_INDEXES) {        \
  173.         fprintf(stderr,"panic: TlsAlloc");                \
  174.         exit(1);                            \
  175.     }                                \
  176.     } STMT_END
  177.  
  178. #if defined(USE_RTL_THREAD_API) && !defined(_MSC_VER)
  179. #define JOIN(t, avp)                            \
  180.     STMT_START {                            \
  181.     if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED)    \
  182.          || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0)    \
  183.          || (CloseHandle((t)->self) == 0))                \
  184.         Perl_croak_nocontext("panic: JOIN");            \
  185.     *avp = (AV *)((t)->i.retv);                    \
  186.     } STMT_END
  187. #else    /* !USE_RTL_THREAD_API || _MSC_VER */
  188. #define JOIN(t, avp)                            \
  189.     STMT_START {                            \
  190.     if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED)    \
  191.          || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0)    \
  192.          || (CloseHandle((t)->self) == 0))                \
  193.         Perl_croak_nocontext("panic: JOIN");            \
  194.     } STMT_END
  195. #endif    /* !USE_RTL_THREAD_API || _MSC_VER */
  196.  
  197. #define YIELD            Sleep(0)
  198.  
  199. #endif /* _WIN32THREAD_H */
  200.  
  201.