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| author | David Xu <davidxu@FreeBSD.org> | 2003-07-03 13:36:29 +0000 |
|---|---|---|
| committer | David Xu <davidxu@FreeBSD.org> | 2003-07-03 13:36:29 +0000 |
| commit | f399623004bc8a19b8f076167c9858cb12bcf7a3 (patch) | |
| tree | 3a9c8ea250328dbe4e64a79c6913d068fb2ad1e1 | |
| parent | e921a3c976e6f2841902088af2af85448881ce48 (diff) | |
| download | src-f399623004bc8a19b8f076167c9858cb12bcf7a3.tar.gz src-f399623004bc8a19b8f076167c9858cb12bcf7a3.zip | |
If select() is only used for sleep, convert it to nanosleep,
it only need purely wait in user space.
Notes
Notes:
svn path=/head/; revision=117197
| -rw-r--r-- | lib/libkse/thread/thr_select.c | 13 | ||||
| -rw-r--r-- | lib/libpthread/thread/thr_select.c | 13 |
2 files changed, 18 insertions, 8 deletions
diff --git a/lib/libkse/thread/thr_select.c b/lib/libkse/thread/thr_select.c index 6714af02d1ec..25be6a95be6e 100644 --- a/lib/libkse/thread/thr_select.c +++ b/lib/libkse/thread/thr_select.c @@ -50,11 +50,16 @@ __select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout) { struct pthread *curthread = _get_curthread(); + struct timespec ts; int ret; - _thr_enter_cancellation_point(curthread); - ret = __sys_select(numfds, readfds, writefds, exceptfds, timeout); - _thr_leave_cancellation_point(curthread); - + if (numfds == 0 && timeout != NULL) { + TIMEVAL_TO_TIMESPEC(timeout, &ts); + return nanosleep(&ts, NULL); + } else { + _thr_enter_cancellation_point(curthread); + ret = __sys_select(numfds, readfds, writefds, exceptfds, timeout); + _thr_leave_cancellation_point(curthread); + } return ret; } diff --git a/lib/libpthread/thread/thr_select.c b/lib/libpthread/thread/thr_select.c index 6714af02d1ec..25be6a95be6e 100644 --- a/lib/libpthread/thread/thr_select.c +++ b/lib/libpthread/thread/thr_select.c @@ -50,11 +50,16 @@ __select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout) { struct pthread *curthread = _get_curthread(); + struct timespec ts; int ret; - _thr_enter_cancellation_point(curthread); - ret = __sys_select(numfds, readfds, writefds, exceptfds, timeout); - _thr_leave_cancellation_point(curthread); - + if (numfds == 0 && timeout != NULL) { + TIMEVAL_TO_TIMESPEC(timeout, &ts); + return nanosleep(&ts, NULL); + } else { + _thr_enter_cancellation_point(curthread); + ret = __sys_select(numfds, readfds, writefds, exceptfds, timeout); + _thr_leave_cancellation_point(curthread); + } return ret; } |