fix data race between new pthread_key_delete and dtor execution
authorRich Felker <dalias@aerifal.cx>
Mon, 18 Feb 2019 02:46:14 +0000 (21:46 -0500)
committerRich Felker <dalias@aerifal.cx>
Mon, 18 Feb 2019 02:46:14 +0000 (21:46 -0500)
commit805288929fdf511b4044cf07c59e02e2eaa9c546
treefdd2cdfdea58d6b153923f2d7028e5e5e3ca8a5b
parent639bcf251e549f634da9a3e7ef8528eb2ec12505
fix data race between new pthread_key_delete and dtor execution

access to clear the entry in each thread's tsd array for the key being
deleted was not synchronized with __pthread_tsd_run_dtors. I probably
made this mistake from a mistaken belief that the thread list lock was
held during the latter, which of course is not possible since it
executes application code in a still-live-thread context.

while we're at it, expand the interval during which signals are
blocked to cover taking the write lock on key_lock, so that a signal
at an inopportune time doesn't block forward progress of readers.
src/thread/pthread_key_create.c