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process.c: ensure th->interrupt lock is held when migrating

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w->cond may be changed without our knowledge in waitpid_nogvl
without th->interrupt_lock

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64201 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2018-08-06 01:06:21 +00:00
parent 217bdd776f
commit 5ca416bdf6
1 changed files with 20 additions and 6 deletions
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26
process.c
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@ -941,6 +941,24 @@ int rb_sigwait_fd_get(const rb_thread_t *);
void rb_sigwait_sleep(const rb_thread_t *, int fd, const struct timespec *);
void rb_sigwait_fd_put(const rb_thread_t *, int fd);
static int
sigwait_fd_migrate_signaled_p(struct waitpid_state *w)
{
int signaled = FALSE;
rb_thread_t *th = w->ec ? rb_ec_thread_ptr(w->ec) : 0;
if (th) rb_native_mutex_lock(&th->interrupt_lock);
if (w->cond) {
rb_native_cond_signal(w->cond);
signaled = TRUE;
}
if (th) rb_native_mutex_unlock(&th->interrupt_lock);
return signaled;
}
/*
* When a thread is done using sigwait_fd and there are other threads
* sleeping on waitpid, we must kick one of the threads out of
@ -952,14 +970,10 @@ sigwait_fd_migrate_sleeper(rb_vm_t *vm)
struct waitpid_state *w = 0;
list_for_each(&vm->waiting_pids, w, wnode) {
if (!w->cond) continue; /* somebody else already got sigwait_fd */
rb_native_cond_signal(w->cond);
return;
if (sigwait_fd_migrate_signaled_p(w)) return;
}
list_for_each(&vm->waiting_grps, w, wnode) {
if (!w->cond) continue; /* somebody else already got sigwait_fd */
rb_native_cond_signal(w->cond);
return;
if (sigwait_fd_migrate_signaled_p(w)) return;
}
}