-/*typedef CRITICAL_SECTION perl_mutex;*/
-typedef HANDLE perl_mutex;
-typedef HANDLE perl_cond;
+#ifndef _WIN32THREAD_H
+#define _WIN32THREAD_H
+typedef struct win32_cond { LONG waiters; HANDLE sem; } perl_cond;
typedef DWORD perl_key;
-typedef HANDLE perl_thread;
+typedef HANDLE perl_os_thread;
+
+#ifndef DONT_USE_CRITICAL_SECTION
-/* XXX Critical Sections used instead of mutexes: lightweight,
+/* 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)
-*/
+#else
+
+typedef HANDLE perl_mutex;
#define MUTEX_INIT(m) \
STMT_START { \
if ((*(m) = CreateMutex(NULL,FALSE,NULL)) == NULL) \
croak("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) \
+ croak("panic: COND_INIT (%ld)",GetLastError()); \
} STMT_END
+
#define COND_SIGNAL(c) \
STMT_START { \
- if (PulseEvent(*(c)) == 0) \
+ if ((c)->waiters > 0 && \
+ ReleaseSemaphore((c)->sem,1,NULL) == 0) \
croak("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) \
+ croak("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)\
+ croak("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) \
+ croak("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"); \
} \
} 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
+
+/* 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) struct perl_thread *Perl_current_thread;
+#define SET_THR(t) (Perl_current_thread = t)
+#define THR Perl_current_thread
+#else
+#define THR Perl_getTHR()
+#define SET_THR(t) Perl_setTHR(t)
+#endif
+struct perl_thread;
+
+void Perl_alloc_thread_key _((void));
+int Perl_thread_create _((struct perl_thread *thr, thread_func_t *fn));
+void Perl_set_thread_self _((struct perl_thread *thr));
+struct perl_thread *Perl_getTHR _((void));
+void Perl_setTHR _((struct perl_thread *t));
+void Perl_init_thread_intern _((struct perl_thread *t));
+
+END_EXTERN_C
+
+#define INIT_THREADS NOOP
+#define ALLOC_THREAD_KEY Perl_alloc_thread_key()
+#define SET_THREAD_SELF(thr) Perl_set_thread_self(thr)
+
+#if defined(USE_RTL_THREAD_API) && !defined(_MSC_VER)
#define JOIN(t, avp) \
STMT_START { \
- if ((WaitForSingleObject((t)->Tself,INFINITE) == WAIT_FAILED) \
- || (GetExitCodeThread((t)->Tself,(LPDWORD)(avp)) == 0)) \
+ if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED) \
+ || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0) \
+ || (CloseHandle((t)->self) == 0)) \
croak("panic: JOIN"); \
+ *avp = (AV *)((t)->i.retv); \
} STMT_END
-
-#define SET_THR(t) \
- STMT_START { \
- if (TlsSetValue(thr_key, (void *) (t)) == 0) \
- croak("panic: TlsSetValue"); \
+#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)) \
+ croak("panic: JOIN"); \
} STMT_END
+#endif /* !USE_RTL_THREAD_API || _MSC_VER */
-#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 YIELD Sleep(0)
+
+#endif /* _WIN32THREAD_H */
+
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