diff options
Diffstat (limited to 'sys/kern/kern_sig.c')
| -rw-r--r-- | sys/kern/kern_sig.c | 44 |
1 files changed, 35 insertions, 9 deletions
diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c index 9e16570c21c..4f0a6af6e89 100644 --- a/sys/kern/kern_sig.c +++ b/sys/kern/kern_sig.c @@ -1,4 +1,4 @@ -/* $OpenBSD: kern_sig.c,v 1.157 2014/01/21 01:48:44 tedu Exp $ */ +/* $OpenBSD: kern_sig.c,v 1.158 2014/02/09 11:17:19 kettenis Exp $ */ /* $NetBSD: kern_sig.c,v 1.54 1996/04/22 01:38:32 christos Exp $ */ /* @@ -1071,6 +1071,9 @@ out: * * while (signum = CURSIG(curproc)) * postsig(signum); + * + * Assumes that if the P_SINTR flag is set, we're holding both the + * kernel and scheduler locks. */ int issignal(struct proc *p) @@ -1105,9 +1108,11 @@ issignal(struct proc *p) */ p->p_xstat = signum; - KERNEL_LOCK(); - single_thread_set(p, SINGLE_SUSPEND, 0); - KERNEL_UNLOCK(); + if (dolock) + KERNEL_LOCK(); + single_thread_set(p, SINGLE_PTRACE, 0); + if (dolock) + KERNEL_UNLOCK(); if (dolock) SCHED_LOCK(s); @@ -1115,9 +1120,11 @@ issignal(struct proc *p) if (dolock) SCHED_UNLOCK(s); - KERNEL_LOCK(); + if (dolock) + KERNEL_LOCK(); single_thread_clear(p, 0); - KERNEL_UNLOCK(); + if (dolock) + KERNEL_UNLOCK(); /* * If we are no longer being traced, or the parent @@ -1829,6 +1836,8 @@ single_thread_check(struct proc *p, int deep) * where the other threads should stop: * - SINGLE_SUSPEND: stop wherever they are, will later either be told to exit * (by setting to SINGLE_EXIT) or be released (via single_thread_clear()) + * - SINGLE_PTRACE: stop wherever they are, will wait for them to stop + * later (via single_thread_wait()) and released as with SINGLE_SUSPEND * - SINGLE_UNWIND: just unwind to kernel boundary, will be told to exit * or released as with SINGLE_SUSPEND * - SINGLE_EXIT: unwind to kernel boundary and exit @@ -1840,11 +1849,16 @@ single_thread_set(struct proc *p, enum single_thread_mode mode, int deep) struct proc *q; int error; +#ifdef MULTIPROCESSOR + KASSERT(__mp_lock_held(&kernel_lock)); +#endif + if ((error = single_thread_check(p, deep))) return error; switch (mode) { case SINGLE_SUSPEND: + case SINGLE_PTRACE: break; case SINGLE_UNWIND: atomic_setbits_int(&pr->ps_flags, PS_SINGLEUNWIND); @@ -1887,7 +1901,8 @@ single_thread_set(struct proc *p, enum single_thread_mode mode, int deep) /* if it's not interruptible, then just have to wait */ if (q->p_flag & P_SINTR) { /* merely need to suspend? just stop it */ - if (mode == SINGLE_SUSPEND) { + if (mode == SINGLE_SUSPEND || + mode == SINGLE_PTRACE) { q->p_stat = SSTOP; break; } @@ -1913,10 +1928,18 @@ single_thread_set(struct proc *p, enum single_thread_mode mode, int deep) SCHED_UNLOCK(s); } + if (mode != SINGLE_PTRACE) + single_thread_wait(pr); + + return 0; +} + +void +single_thread_wait(struct process *pr) +{ /* wait until they're all suspended */ while (pr->ps_singlecount > 0) tsleep(&pr->ps_singlecount, PUSER, "suspend", 0); - return 0; } void @@ -1926,7 +1949,10 @@ single_thread_clear(struct proc *p, int flag) struct proc *q; KASSERT(pr->ps_single == p); - +#ifdef MULTIPROCESSOR + KASSERT(__mp_lock_held(&kernel_lock)); +#endif + pr->ps_single = NULL; atomic_clearbits_int(&pr->ps_flags, PS_SINGLEUNWIND | PS_SINGLEEXIT); TAILQ_FOREACH(q, &pr->ps_threads, p_thr_link) { |