diff options
Diffstat (limited to 'usr/src/uts/common/os/schedctl.c')
| -rw-r--r-- | usr/src/uts/common/os/schedctl.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/usr/src/uts/common/os/schedctl.c b/usr/src/uts/common/os/schedctl.c index 5721083751..18b396a765 100644 --- a/usr/src/uts/common/os/schedctl.c +++ b/usr/src/uts/common/os/schedctl.c @@ -22,6 +22,7 @@ /* * Copyright 2010 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. + * Copyright 2016 Joyent, Inc. */ #include <sys/types.h> @@ -327,12 +328,17 @@ schedctl_sigblock(kthread_t *t) /* - * If the sc_sigblock field is set for the specified thread, set - * its signal mask to block all maskable signals, then clear the - * sc_sigblock field. This finishes what user-level code requested - * to be done when it set tdp->sc_shared->sc_sigblock non-zero. - * Called from signal-related code either by the current thread for - * itself or by a thread that holds the process's p_lock (/proc code). + * If the sc_sigblock field is set for the specified thread, set its signal + * mask to block all maskable signals, then clear the sc_sigblock field. This + * accomplishes what user-level code requested to be done when it set + * tdp->sc_shared->sc_sigblock non-zero. + * + * This is generally called by signal-related code in the current thread. In + * order to call against a thread other than curthread, p_lock for the + * containing process must be held. Even then, the caller is not protected + * from races with the thread in question updating its own fields. It is the + * responsibility of the caller to perform additional synchronization. + * */ void schedctl_finish_sigblock(kthread_t *t) |