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When a STOP signal is being sent to a process, it is possible all

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threads in the process have already masked the signal, so job control
is delayed. But later a thread unmasking the STOP signal should enable
job control, so in issignal(), scanning all threads in process to see
if we can direct suspend some of them, not just suspend current thread.
This commit is contained in:
davidxu 2003-06-20 03:36:45 +00:00
parent c9dc9c81b7
commit d27c98ff96
1 changed files with 16 additions and 2 deletions
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18
sys/kern/kern_sig.c
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@ -1760,8 +1760,12 @@ tdsignal(struct thread *td, int sig)
mtx_lock_spin(&sched_lock);
FOREACH_THREAD_IN_PROC(p, td0) {
if (TD_IS_SLEEPING(td0) &&
(td0->td_flags & TDF_SINTR))
(td0->td_flags & TDF_SINTR) &&
!TD_IS_SUSPENDED(td0)) {
thread_suspend_one(td0);
} else if (td != td0) {
td0->td_flags |= TDF_ASTPENDING;
}
}
thread_stopped(p);
if (p->p_numthreads == p->p_suspcount) {
@ -1898,7 +1902,8 @@ issignal(td)
struct proc *p;
struct sigacts *ps;
sigset_t sigpending;
register int sig, prop;
int sig, prop;
struct thread *td0;
p = td->td_proc;
ps = p->p_sigacts;
@ -2019,6 +2024,15 @@ issignal(td)
p->p_flag |= P_STOPPED_SIG;
p->p_xstat = sig;
mtx_lock_spin(&sched_lock);
FOREACH_THREAD_IN_PROC(p, td0) {
if (TD_IS_SLEEPING(td0) &&
(td0->td_flags & TDF_SINTR) &&
!TD_IS_SUSPENDED(td0)) {
thread_suspend_one(td0);
} else if (td != td0) {
td0->td_flags |= TDF_ASTPENDING;
}
}
thread_stopped(p);
thread_suspend_one(td);
PROC_UNLOCK(p);