fluencelabs/musl
1
0
Fork 0
mirror of https://github.com/fluencelabs/musl synced 2025-06-28 14:11:56 +00:00
Code Issues Projects Releases Wiki Activity

block all signals (even internal ones) in cancellation signal handler

Browse Source 
previously the implementation-internal signal used for multithreaded
set*id operations was left unblocked during handling of the
cancellation signal. however, on some archs, signal contexts are huge
(up to 5k) and the possibility of nested signal handlers drastically
increases the minimum stack requirement. since the cancellation signal
handler will do its job and return in bounded time before possibly
passing execution to application code, there is no need to allow other
signals to interrupt it.
This commit is contained in:
Rich Felker
2015-03-16 20:12:49 -04:00
parent eceaf1d29f
commit 76fd01177a
1 changed files with 2 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
src/thread/pthread_cancel.c
View File

@ -1,3 +1,4 @@
#include <string.h>
#include "pthread_impl.h" #include "pthread_impl.h"
#include "syscall.h" #include "syscall.h"
#include "libc.h" #include "libc.h"
@ -80,7 +81,7 @@ static void init_cancellation()
.sa_flags = SA_SIGINFO | SA_RESTART, .sa_flags = SA_SIGINFO | SA_RESTART,
.sa_sigaction = cancel_handler .sa_sigaction = cancel_handler
}; };
sigfillset(&sa.sa_mask); memset(&sa.sa_mask, -1, _NSIG/8);
__libc_sigaction(SIGCANCEL, &sa, 0); __libc_sigaction(SIGCANCEL, &sa, 0);
} }