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Set thread scheduling parameters inside the new thread.

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This makes it possible to restrict threads from modifying scheduling
parameters of another thread in the Chrome Linux sandbox.

BUG=
R=henrike@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/28539004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7324 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
henrike@webrtc.org 2014-09-29 18:25:27 +00:00
parent 626624061e
commit ea6c12e59f
1 changed files with 21 additions and 25 deletions
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46
webrtc/system_wrappers/source/thread_posix.cc
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@ -178,11 +178,6 @@ bool ThreadPosix::Start(unsigned int& thread_id)
int result = pthread_attr_setdetachstate(&attr_, PTHREAD_CREATE_DETACHED);
// Set the stack stack size to 1M.
result |= pthread_attr_setstacksize(&attr_, 1024 * 1024);
#ifdef WEBRTC_THREAD_RR
const int policy = SCHED_RR;
#else
const int policy = SCHED_FIFO;
#endif
event_->Reset();
// If pthread_create was successful, a thread was created and is running.
// Don't return false if it was successful since if there are any other
@ -210,26 +205,6 @@ bool ThreadPosix::Start(unsigned int& thread_id)
#if HAS_THREAD_ID
thread_id = static_cast<unsigned int>(thread_);
#endif
sched_param param;
const int min_prio = sched_get_priority_min(policy);
const int max_prio = sched_get_priority_max(policy);
if ((min_prio == EINVAL) || (max_prio == EINVAL)) {
WEBRTC_TRACE(kTraceError, kTraceUtility, -1,
"unable to retreive min or max priority for threads");
return true;
}
if (max_prio - min_prio <= 2) {
// There is no room for setting priorities with any granularity.
return true;
}
param.sched_priority = ConvertToSystemPriority(prio_, min_prio, max_prio);
result = pthread_setschedparam(thread_, policy, &param);
if (result == EINVAL) {
WEBRTC_TRACE(kTraceError, kTraceUtility, -1,
"unable to set thread priority");
}
return true;
}
@ -326,6 +301,27 @@ void ThreadPosix::Run() {
WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1,
"Thread without name started");
}
#ifdef WEBRTC_THREAD_RR
const int policy = SCHED_RR;
#else
const int policy = SCHED_FIFO;
#endif
const int min_prio = sched_get_priority_min(policy);
const int max_prio = sched_get_priority_max(policy);
if ((min_prio == -1) || (max_prio == -1)) {
WEBRTC_TRACE(kTraceError, kTraceUtility, -1,
"unable to retreive min or max priority for threads");
}
if (max_prio - min_prio > 2) {
sched_param param;
param.sched_priority = ConvertToSystemPriority(prio_, min_prio, max_prio);
if (pthread_setschedparam(pthread_self(), policy, &param) != 0) {
WEBRTC_TRACE(
kTraceError, kTraceUtility, -1, "unable to set thread priority");
}
}
bool alive = true;
bool run = true;
while (alive) {