diff options
Diffstat (limited to 'win/tclWinThrd.c')
| -rw-r--r-- | win/tclWinThrd.c | 57 |
1 files changed, 53 insertions, 4 deletions
diff --git a/win/tclWinThrd.c b/win/tclWinThrd.c index 8fe2596..b3e23fd 100644 --- a/win/tclWinThrd.c +++ b/win/tclWinThrd.c @@ -9,7 +9,7 @@ * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclWinThrd.c,v 1.8 2000/04/20 01:30:20 hobbs Exp $ + * RCS: @(#) $Id: tclWinThrd.c,v 1.9 2000/05/02 22:02:38 kupries Exp $ */ #include "tclWinInt.h" @@ -45,6 +45,15 @@ static CRITICAL_SECTION allocLock; static Tcl_Mutex allocLockPtr = (Tcl_Mutex) &allocLock; /* + * The joinLock serializes Create- and ExitThread. This is necessary to + * prevent a race where a new joinable thread exits before the creating + * thread had the time to create the necessary data structures in the + * emulation layer. + */ + +static CRITICAL_SECTION joinLock; + +/* * Condition variables are implemented with a combination of a * per-thread Windows Event and a per-condition waiting queue. * The idea is that each thread has its own Event that it waits @@ -125,11 +134,20 @@ Tcl_CreateThread(idPtr, proc, clientData, stackSize, flags) { unsigned long code; + EnterCriticalSection(&joinLock); + code = _beginthreadex(NULL, stackSize, proc, clientData, 0, (unsigned *)idPtr); + if (code == 0) { + LeaveCriticalSection(&joinLock); return TCL_ERROR; } else { + if (flags & TCL_THREAD_JOINABLE) { + TclRememberJoinableThread (*idPtr); + } + + LeaveCriticalSection(&joinLock); return TCL_OK; } } @@ -137,6 +155,33 @@ Tcl_CreateThread(idPtr, proc, clientData, stackSize, flags) /* *---------------------------------------------------------------------- * + * Tcl_JoinThread -- + * + * This procedure waits upon the exit of the specified thread. + * + * Results: + * TCL_OK if the wait was successful, TCL_ERROR else. + * + * Side effects: + * The result area is set to the exit code of the thread we + * waited upon. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_JoinThread(id, result) + Tcl_ThreadId id; /* Id of the thread to wait upon */ + int* result; /* Reference to the storage the result + * of the thread we wait upon will be + * written into. */ +{ + return TclJoinThread (id, result); +} + +/* + *---------------------------------------------------------------------- + * * TclpThreadExit -- * * This procedure terminates the current thread. @@ -154,6 +199,10 @@ void TclpThreadExit(status) int status; { + EnterCriticalSection(&joinLock); + TclSignalExitThread (Tcl_GetCurrentThread (), status); + LeaveCriticalSection(&joinLock); + _endthreadex((DWORD)status); } @@ -609,7 +658,7 @@ TclpFinalizeThreadDataKey(keyPtr) * Tcl_ConditionWait -- * * This procedure is invoked to wait on a condition variable. - * The mutex is automically released as part of the wait, and + * The mutex is atomically released as part of the wait, and * automatically grabbed when the condition is signaled. * * The mutex must be held when this procedure is called. @@ -647,7 +696,7 @@ Tcl_ConditionWait(condPtr, mutexPtr, timePtr) } /* - * Self initialize the two parts of the contition. + * Self initialize the two parts of the condition. * The per-condition and per-thread parts need to be * handled independently. */ @@ -672,7 +721,7 @@ Tcl_ConditionWait(condPtr, mutexPtr, timePtr) if (doExit) { /* * Create a per-thread exit handler to clean up the condEvent. - * We must be careful do do this outside the Master Lock + * We must be careful to do this outside the Master Lock * because Tcl_CreateThreadExitHandler uses its own * ThreadSpecificData, and initializing that may drop * back into the Master Lock. |