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Block SIG_RESUME in the main thread of the Posix port so that sigwait works as expected (#532)

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Co-authored-by: alfred gedeon <28123637+alfred2g@users.noreply.github.com>
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Chris Copeland 2022-08-04 11:11:31 -07:00 committed by GitHub
parent 4a8c06689e
commit fc615627f6
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1 changed files with 9 additions and 16 deletions
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25
portable/ThirdParty/GCC/Posix/port.c vendored
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@ -191,13 +191,19 @@ portBASE_TYPE xPortStartScheduler( void )
* Interrupts are disabled here already. */
prvSetupTimerInterrupt();
/*
* Block SIG_RESUME before starting any tasks so the main thread can sigwait on it.
* To sigwait on an unblocked signal is undefined.
* https://pubs.opengroup.org/onlinepubs/009604499/functions/sigwait.html
*/
sigemptyset( &xSignals );
sigaddset( &xSignals, SIG_RESUME );
( void ) pthread_sigmask( SIG_BLOCK, &xSignals, NULL );
/* Start the first task. */
vPortStartFirstTask();
/* Wait until signaled by vPortEndScheduler(). */
sigemptyset( &xSignals );
sigaddset( &xSignals, SIG_RESUME );
while( xSchedulerEnd != pdTRUE )
{
sigwait( &xSignals, &iSignal );
@ -543,23 +549,10 @@ static void prvSetupSignalsAndSchedulerPolicy( void )
&xAllSignals,
&xSchedulerOriginalSignalMask );
/* SIG_RESUME is only used with sigwait() so doesn't need a
* handler. */
sigresume.sa_flags = 0;
sigresume.sa_handler = SIG_IGN;
sigfillset( &sigresume.sa_mask );
sigtick.sa_flags = 0;
sigtick.sa_handler = vPortSystemTickHandler;
sigfillset( &sigtick.sa_mask );
iRet = sigaction( SIG_RESUME, &sigresume, NULL );
if( iRet == -1 )
{
prvFatalError( "sigaction", errno );
}
iRet = sigaction( SIGALRM, &sigtick, NULL );
if( iRet == -1 )