X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=win32%2Fwin32thread.h;h=a86ea61f0474bb011b77b01176907f4691e9299b;hb=cb1ce60838923277ddef8cb8d26370507470dbd7;hp=46e0a58fb6711ecbd77f885ed503fa9e3dc2931f;hpb=ea0efc06fdad2019ffceb86d079dd853e9d79cea;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/win32/win32thread.h b/win32/win32thread.h
index 46e0a58..a86ea61 100644
--- a/win32/win32thread.h
+++ b/win32/win32thread.h
@@ -1,102 +1,207 @@
-/*typedef CRITICAL_SECTION perl_mutex;*/
-typedef HANDLE perl_mutex;
-typedef HANDLE perl_cond;
+#ifndef _WIN32THREAD_H
+#define _WIN32THREAD_H
+
+#include "win32.h"
+
+typedef struct win32_cond { LONG waiters; HANDLE sem; } perl_cond;
 typedef DWORD perl_key;
-typedef HANDLE perl_thread;
+typedef HANDLE perl_os_thread;
 
-/* XXX Critical Sections used instead of mutexes: lightweight,
+#ifndef DONT_USE_CRITICAL_SECTION
+
+/* Critical Sections used instead of mutexes: lightweight,
  * but can't be communicated to child processes, and can't get
- * HANDLE to it for use elsewhere
+ * HANDLE to it for use elsewhere.
  */
-/*
+typedef CRITICAL_SECTION perl_mutex;
 #define MUTEX_INIT(m) InitializeCriticalSection(m)
 #define MUTEX_LOCK(m) EnterCriticalSection(m)
 #define MUTEX_UNLOCK(m) LeaveCriticalSection(m)
 #define MUTEX_DESTROY(m) DeleteCriticalSection(m)
-*/
 
-#define MUTEX_INIT(m) \
+#else
+
+typedef HANDLE perl_mutex;
+#  define MUTEX_INIT(m) \
     STMT_START {						\
 	if ((*(m) = CreateMutex(NULL,FALSE,NULL)) == NULL)	\
-	    croak("panic: MUTEX_INIT");				\
+	    Perl_croak_nocontext("panic: MUTEX_INIT");		\
     } STMT_END
-#define MUTEX_LOCK(m) \
+
+#  define MUTEX_LOCK(m) \
     STMT_START {						\
 	if (WaitForSingleObject(*(m),INFINITE) == WAIT_FAILED)	\
-	    croak("panic: MUTEX_LOCK");				\
+	    Perl_croak_nocontext("panic: MUTEX_LOCK");		\
     } STMT_END
-#define MUTEX_UNLOCK(m) \
+
+#  define MUTEX_UNLOCK(m) \
     STMT_START {						\
 	if (ReleaseMutex(*(m)) == 0)				\
-	    croak("panic: MUTEX_UNLOCK");			\
+	    Perl_croak_nocontext("panic: MUTEX_UNLOCK");	\
     } STMT_END
-#define MUTEX_DESTROY(m) \
+
+#  define MUTEX_DESTROY(m) \
     STMT_START {						\
 	if (CloseHandle(*(m)) == 0)				\
-	    croak("panic: MUTEX_DESTROY");			\
+	    Perl_croak_nocontext("panic: MUTEX_DESTROY");	\
     } STMT_END
 
+#endif
+
+/* These macros assume that the mutex associated with the condition
+ * will always be held before COND_{SIGNAL,BROADCAST,WAIT,DESTROY},
+ * so there's no separate mutex protecting access to (c)->waiters
+ */
 #define COND_INIT(c) \
     STMT_START {						\
-	if ((*(c) = CreateEvent(NULL,TRUE,FALSE,NULL)) == NULL)	\
-	    croak("panic: COND_INIT");				\
+	(c)->waiters = 0;					\
+	(c)->sem = CreateSemaphore(NULL,0,LONG_MAX,NULL);	\
+	if ((c)->sem == NULL)					\
+	    Perl_croak_nocontext("panic: COND_INIT (%ld)",GetLastError());	\
     } STMT_END
+
 #define COND_SIGNAL(c) \
     STMT_START {						\
-	if (PulseEvent(*(c)) == 0)				\
-	    croak("panic: COND_SIGNAL (%ld)",GetLastError());	\
+	if ((c)->waiters > 0 &&					\
+	    ReleaseSemaphore((c)->sem,1,NULL) == 0)		\
+	    Perl_croak_nocontext("panic: COND_SIGNAL (%ld)",GetLastError());	\
     } STMT_END
+
 #define COND_BROADCAST(c) \
     STMT_START {						\
-	if (PulseEvent(*(c)) == 0)				\
-	    croak("panic: COND_BROADCAST");			\
+	if ((c)->waiters > 0 &&					\
+	    ReleaseSemaphore((c)->sem,(c)->waiters,NULL) == 0)	\
+	    Perl_croak_nocontext("panic: COND_BROADCAST (%ld)",GetLastError());\
     } STMT_END
-/* #define COND_WAIT(c, m) \
-    STMT_START {						\
-	if (WaitForSingleObject(*(c),INFINITE) == WAIT_FAILED)	\
-	    croak("panic: COND_WAIT");				\
-    } STMT_END
-*/
+
 #define COND_WAIT(c, m) \
     STMT_START {						\
-	if (SignalObjectAndWait(*(m),*(c),INFINITE,FALSE) == WAIT_FAILED)\
-	    croak("panic: COND_WAIT");				\
-	else							\
-	    MUTEX_LOCK(m);					\
+	(c)->waiters++;						\
+	MUTEX_UNLOCK(m);					\
+	/* Note that there's no race here, since a		\
+	 * COND_BROADCAST() on another thread will have seen the\
+	 * right number of waiters (i.e. including this one) */	\
+	if (WaitForSingleObject((c)->sem,INFINITE)==WAIT_FAILED)\
+	    Perl_croak_nocontext("panic: COND_WAIT (%ld)",GetLastError());	\
+	/* XXX there may be an inconsequential race here */	\
+	MUTEX_LOCK(m);						\
+	(c)->waiters--;						\
     } STMT_END
+
 #define COND_DESTROY(c) \
     STMT_START {						\
-	if (CloseHandle(*(c)) == 0)				\
-	    croak("panic: COND_DESTROY");			\
+	(c)->waiters = 0;					\
+	if (CloseHandle((c)->sem) == 0)				\
+	    Perl_croak_nocontext("panic: COND_DESTROY (%ld)",GetLastError());	\
     } STMT_END
 
 #define DETACH(t) \
     STMT_START {						\
-	if (CloseHandle((t)->Tself) == 0) {			\
+	if (CloseHandle((t)->self) == 0) {			\
 	    MUTEX_UNLOCK(&(t)->mutex);				\
-	    croak("panic: DETACH");				\
+	    Perl_croak_nocontext("panic: DETACH");		\
 	}							\
     } STMT_END
 
-#define THR ((struct thread *) TlsGetValue(thr_key))
 
-#define HAVE_THREAD_INTERN
+#define THREAD_CREATE(t, f)	Perl_thread_create(t, f)
+#define THREAD_POST_CREATE(t)	NOOP
 
-#define JOIN(t, avp)							\
+/* XXX Docs mention that the RTL versions of thread creation routines
+ * should be used, but that advice only seems applicable when the RTL
+ * is not in a DLL.  RTL DLLs in both Borland and VC seem to do all of
+ * the init/deinit required upon DLL_THREAD_ATTACH/DETACH.  So we seem
+ * to be completely safe using straight Win32 API calls, rather than
+ * the much braindamaged RTL calls.
+ *
+ * _beginthread() in the RTLs call CloseHandle() just after the thread
+ * function returns, which means: 1) we have a race on our hands
+ * 2) it is impossible to implement join() semantics.
+ *
+ * IOW, do *NOT* turn on USE_RTL_THREAD_API!  It is here
+ * for experimental purposes only. GSAR 98-01-02
+ */
+#ifdef USE_RTL_THREAD_API
+#  include <process.h>
+#  if defined(__BORLANDC__)
+     /* Borland RTL doesn't allow a return value from thread function! */
+#    define THREAD_RET_TYPE	void _USERENTRY
+#    define THREAD_RET_CAST(p)	((void)(thr->i.retv = (void *)(p)))
+#  elif defined (_MSC_VER)
+#    define THREAD_RET_TYPE	unsigned __stdcall
+#    define THREAD_RET_CAST(p)	((unsigned)(p))
+#  else
+     /* CRTDLL.DLL doesn't allow a return value from thread function! */
+#    define THREAD_RET_TYPE	void __cdecl
+#    define THREAD_RET_CAST(p)	((void)(thr->i.retv = (void *)(p)))
+#  endif
+#else	/* !USE_RTL_THREAD_API */
+#  define THREAD_RET_TYPE	DWORD WINAPI
+#  define THREAD_RET_CAST(p)	((DWORD)(p))
+#endif	/* !USE_RTL_THREAD_API */
+
+typedef THREAD_RET_TYPE thread_func_t(void *);
+
+
+START_EXTERN_C
+
+#if defined(PERLDLL) && defined(USE_DECLSPEC_THREAD) && (!defined(__BORLANDC__) || defined(_DLL))
+extern __declspec(thread) void *PL_current_context;
+#define PERL_SET_CONTEXT(t)   		(PL_current_context = t)
+#define PERL_GET_CONTEXT		PL_current_context
+#else
+#define PERL_GET_CONTEXT		Perl_get_context()
+#define PERL_SET_CONTEXT(t)		Perl_set_context(t)
+#endif
+
+#if defined(USE_5005THREADS)
+struct perl_thread;
+int Perl_thread_create (struct perl_thread *thr, thread_func_t *fn);
+void Perl_set_thread_self (struct perl_thread *thr);
+void Perl_init_thread_intern (struct perl_thread *t);
+
+#define SET_THREAD_SELF(thr) Perl_set_thread_self(thr)
+
+#endif /* USE_5005THREADS */
+
+END_EXTERN_C
+
+#define INIT_THREADS		NOOP
+#define ALLOC_THREAD_KEY \
     STMT_START {							\
-	if ((WaitForSingleObject((t)->Tself,INFINITE) == WAIT_FAILED)	\
-             || (GetExitCodeThread((t)->Tself,(LPDWORD)(avp)) == 0))	\
-	    croak("panic: JOIN");					\
+	if ((PL_thr_key = TlsAlloc()) == TLS_OUT_OF_INDEXES) {		\
+	    PerlIO_printf(PerlIO_stderr(),"panic: TlsAlloc");				\
+	    exit(1);							\
+	}								\
     } STMT_END
 
-#define SET_THR(t)					\
-    STMT_START {					\
-	if (TlsSetValue(thr_key, (void *) (t)) == 0)	\
-	    croak("panic: TlsSetValue");		\
+#define FREE_THREAD_KEY \
+    STMT_START {							\
+	TlsFree(PL_thr_key);						\
     } STMT_END
 
-#define THREAD_CREATE(t, f)	thread_create(t, f)
-#define THREAD_POST_CREATE(t)	NOOP
-#define THREAD_RET_TYPE		DWORD WINAPI
-#define THREAD_RET_CAST(p)	((DWORD)(p))
+#define PTHREAD_ATFORK(prepare,parent,child)	NOOP
+
+#if defined(USE_RTL_THREAD_API) && !defined(_MSC_VER)
+#define JOIN(t, avp)							\
+    STMT_START {							\
+	if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED)	\
+	     || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0)	\
+	     || (CloseHandle((t)->self) == 0))				\
+	    Perl_croak_nocontext("panic: JOIN");			\
+	*avp = (AV *)((t)->i.retv);					\
+    } STMT_END
+#else	/* !USE_RTL_THREAD_API || _MSC_VER */
+#define JOIN(t, avp)							\
+    STMT_START {							\
+	if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED)	\
+	     || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0)	\
+	     || (CloseHandle((t)->self) == 0))				\
+	    Perl_croak_nocontext("panic: JOIN");			\
+    } STMT_END
+#endif	/* !USE_RTL_THREAD_API || _MSC_VER */
+
 #define YIELD			Sleep(0)
+
+#endif /* _WIN32THREAD_H */
+