path: root/src/thread/pthread_self.c
diff options
authorRich Felker <>2011-04-17 15:30:08 -0400
committerRich Felker <>2011-04-17 15:30:08 -0400
commit09dae2b7b66f741b30aa7ce95ab395239da20762 (patch)
treeda94ed95c914ec60663aec3368e3642d8c41cfeb /src/thread/pthread_self.c
parentebf82447be4b30bedc19ad868c3a0662b1ba596d (diff)
fix bugs in cancellable syscall asm
x86_64 was just plain wrong in the cancel-flag-already-set path, and crashing. the more subtle error was not clearing the saved stack pointer before returning to c code. this could result in the signal handler misidentifying c code as the pre-syscall part of the asm, and acting on cancellation at the wrong time, and thus resource leak race conditions. also, now __cancel (in the c code) is responsible for clearing the saved sp in the already-cancelled branch. this means we have to use call rather than jmp to ensure the stack pointer in the c will never match what the asm saved.
Diffstat (limited to 'src/thread/pthread_self.c')
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