From b92bea5d2a9481de69bb627a7b442a9f58fca43d Mon Sep 17 00:00:00 2001 From: Zbigniew Jędrzejewski-Szmek Date: Sun, 24 Mar 2013 19:59:00 -0400 Subject: Use initalization instead of explicit zeroing MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Before, we would initialize many fields twice: first by filling the structure with zeros, and then a second time with the real values. We can let the compiler do the job for us, avoiding one copy. A downside of this patch is that text gets slightly bigger. This is because all zero() calls are effectively inlined: $ size build/.libs/systemd text data bss dec hex filename before 897737 107300 2560 1007597 f5fed build/.libs/systemd after 897873 107300 2560 1007733 f6075 build/.libs/systemd … actually less than 1‰. A few asserts that the parameter is not null had to be removed. I don't think this changes much, because first, it is quite unlikely for the assert to fail, and second, an immediate SEGV is almost as good as an assert. --- src/core/job.c | 22 +++++++++------------- 1 file changed, 9 insertions(+), 13 deletions(-) (limited to 'src/core/job.c') diff --git a/src/core/job.c b/src/core/job.c index d5b7987a00..af5855b71d 100644 --- a/src/core/job.c +++ b/src/core/job.c @@ -858,10 +858,12 @@ finish: } int job_start_timer(Job *j) { - struct itimerspec its; - struct epoll_event ev; + struct itimerspec its = {}; + struct epoll_event ev = { + .data.ptr = &j->timer_watch, + .events = EPOLLIN, + }; int fd, r; - assert(j); if (j->unit->job_timeout <= 0 || j->timer_watch.type == WATCH_JOB_TIMER) @@ -874,7 +876,6 @@ int job_start_timer(Job *j) { goto fail; } - zero(its); timespec_store(&its.it_value, j->unit->job_timeout); if (timerfd_settime(fd, 0, &its, NULL) < 0) { @@ -882,10 +883,6 @@ int job_start_timer(Job *j) { goto fail; } - zero(ev); - ev.data.ptr = &j->timer_watch; - ev.events = EPOLLIN; - if (epoll_ctl(j->manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) { r = -errno; goto fail; @@ -1064,15 +1061,14 @@ int job_deserialize(Job *j, FILE *f, FDSet *fds) { } int job_coldplug(Job *j) { - struct epoll_event ev; + struct epoll_event ev = { + .data.ptr = &j->timer_watch, + .events = EPOLLIN, + }; if (j->timer_watch.type != WATCH_JOB_TIMER) return 0; - zero(ev); - ev.data.ptr = &j->timer_watch; - ev.events = EPOLLIN; - if (epoll_ctl(j->manager->epoll_fd, EPOLL_CTL_ADD, j->timer_watch.fd, &ev) < 0) return -errno; -- cgit v1.2.3-54-g00ecf