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author | dgp <dgp@users.sourceforge.net> | 2013-08-14 18:00:45 (GMT) |
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committer | dgp <dgp@users.sourceforge.net> | 2013-08-14 18:00:45 (GMT) |
commit | a733cde27c904a40aae56e93c7daa369e2a4d045 (patch) | |
tree | 77fdf9d45381002ae272a660dd3090c4d9459dc5 /unix/tclUnixNotfy.c | |
parent | 133a3b34b7419b202d6588f44871ea67176a5064 (diff) | |
parent | 2b3657769b1d0b9ae6e10113b1d3c038b4967899 (diff) | |
download | tcl-a733cde27c904a40aae56e93c7daa369e2a4d045.zip tcl-a733cde27c904a40aae56e93c7daa369e2a4d045.tar.gz tcl-a733cde27c904a40aae56e93c7daa369e2a4d045.tar.bz2 |
merge trunk
Diffstat (limited to 'unix/tclUnixNotfy.c')
-rw-r--r-- | unix/tclUnixNotfy.c | 125 |
1 files changed, 118 insertions, 7 deletions
diff --git a/unix/tclUnixNotfy.c b/unix/tclUnixNotfy.c index b87af1b..c6c9759 100644 --- a/unix/tclUnixNotfy.c +++ b/unix/tclUnixNotfy.c @@ -96,7 +96,7 @@ typedef struct ThreadSpecificData { * that an event is ready to be processed * by sending this event. */ void *hwnd; /* Messaging window. */ -#else +#else /* !__CYGWIN__ */ Tcl_Condition waitCV; /* Any other thread alerts a notifier that an * event is ready to be processed by signaling * this condition variable. */ @@ -120,6 +120,15 @@ static Tcl_ThreadDataKey dataKey; static int notifierCount = 0; /* + * The following static stores the process ID of the initialized notifier + * thread. If it changes, we have passed a fork and we should start a new + * notifier thread. + * + * You must hold the notifierMutex lock before accessing this variable. + */ +static pid_t processIDInitialized = 0; + +/* * The following variable points to the head of a doubly-linked list of * ThreadSpecificData structures for all threads that are currently waiting on * an event. @@ -184,9 +193,15 @@ static Tcl_ThreadId notifierThread; */ #ifdef TCL_THREADS -static void NotifierThreadProc(ClientData clientData); -#endif -static int FileHandlerEventProc(Tcl_Event *evPtr, int flags); +static void NotifierThreadProc(ClientData clientData); +#ifdef HAVE_PTHREAD_ATFORK +static int atForkInit = 0; +static void AtForkPrepare(void); +static void AtForkParent(void); +static void AtForkChild(void); +#endif /* HAVE_PTHREAD_ATFORK */ +#endif /* TCL_THREADS */ +static int FileHandlerEventProc(Tcl_Event *evPtr, int flags); /* * Import of Windows API when building threaded with Cygwin. @@ -213,14 +228,14 @@ typedef struct { void *hCursor; void *hbrBackground; void *lpszMenuName; - void *lpszClassName; + const void *lpszClassName; } WNDCLASS; extern void __stdcall CloseHandle(void *); extern void *__stdcall CreateEventW(void *, unsigned char, unsigned char, void *); -extern void * __stdcall CreateWindowExW(void *, void *, void *, DWORD, int, - int, int, int, void *, void *, void *, void *); +extern void * __stdcall CreateWindowExW(void *, const void *, const void *, + DWORD, int, int, int, int, void *, void *, void *, void *); extern DWORD __stdcall DefWindowProcW(void *, int, void *, void *); extern unsigned char __stdcall DestroyWindow(void *); extern int __stdcall DispatchMessageW(const MSG *); @@ -275,11 +290,38 @@ Tcl_InitNotifier(void) */ Tcl_MutexLock(¬ifierMutex); +#ifdef HAVE_PTHREAD_ATFORK + /* + * Install pthread_atfork handlers to reinitialize the notifier in the + * child of a fork. + */ + + if (!atForkInit) { + int result = pthread_atfork(AtForkPrepare, AtForkParent, AtForkChild); + + if (result) { + Tcl_Panic("Tcl_InitNotifier: pthread_atfork failed"); + } + atForkInit = 1; + } +#endif + /* + * Check if my process id changed, e.g. I was forked + * In this case, restart the notifier thread and close the + * pipe to the original notifier thread + */ + if (notifierCount > 0 && processIDInitialized != getpid()) { + notifierCount = 0; + processIDInitialized = 0; + close(triggerPipe); + triggerPipe = -1; + } if (notifierCount == 0) { if (TclpThreadCreate(¬ifierThread, NotifierThreadProc, NULL, TCL_THREAD_STACK_DEFAULT, TCL_THREAD_JOINABLE) != TCL_OK) { Tcl_Panic("Tcl_InitNotifier: unable to start notifier thread"); } + processIDInitialized = getpid(); } notifierCount++; @@ -1270,6 +1312,75 @@ NotifierThreadProc( TclpThreadExit(0); } + +#ifdef HAVE_PTHREAD_ATFORK +/* + *---------------------------------------------------------------------- + * + * AtForkPrepare -- + * + * Lock the notifier in preparation for a fork. + * + * Results: + * None. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static void +AtForkPrepare(void) +{ +} + +/* + *---------------------------------------------------------------------- + * + * AtForkParent -- + * + * Unlock the notifier in the parent after a fork. + * + * Results: + * None. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static void +AtForkParent(void) +{ +} + +/* + *---------------------------------------------------------------------- + * + * AtForkChild -- + * + * Unlock and reinstall the notifier in the child after a fork. + * + * Results: + * None. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static void +AtForkChild(void) +{ + notifierMutex = NULL; + notifierCV = NULL; + Tcl_InitNotifier(); +} +#endif /* HAVE_PTHREAD_ATFORK */ + #endif /* TCL_THREADS */ #endif /* !HAVE_COREFOUNDATION */ |