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* miscfuncs.cc (yield): Drop thread priority only once.

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This commit is contained in:
Corinna Vinschen 2011-07-07 06:21:24 +00:00
parent 57e64035f8
commit 66965620fc
2 changed files with 7 additions and 3 deletions
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4
winsup/cygwin/ChangeLog
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@ -1,3 +1,7 @@
2011-07-07 Corinna Vinschen <corinna@vinschen.de>
* miscfuncs.cc (yield): Drop thread priority only once.
2011-07-06 Christopher Faylor <me.cygwin2011@cgf.cx> 2011-07-06 Christopher Faylor <me.cygwin2011@cgf.cx>
* exceptions.cc (_cygtls::interrupt_now): Back out previous change * exceptions.cc (_cygtls::interrupt_now): Back out previous change

6
winsup/cygwin/miscfuncs.cc
View File

@ -239,17 +239,17 @@ check_iovec (const struct iovec *iov, int iovcnt, bool forwrite)
void void
yield () yield ()
{ {
int prio = GetThreadPriority (GetCurrentThread ());
SetThreadPriority (GetCurrentThread (), THREAD_PRIORITY_IDLE);
for (int i = 0; i < 2; i++) for (int i = 0; i < 2; i++)
{ {
int prio = GetThreadPriority (GetCurrentThread ());
SetThreadPriority (GetCurrentThread (), THREAD_PRIORITY_IDLE);
/* MSDN implies that SleepEx(0,...) will force scheduling of other /* MSDN implies that SleepEx(0,...) will force scheduling of other
threads. Unlike SwitchToThread() the documentation does not mention threads. Unlike SwitchToThread() the documentation does not mention
other cpus so, presumably (hah!), this + using a lower priority will other cpus so, presumably (hah!), this + using a lower priority will
stall this thread temporarily and cause another to run. */ stall this thread temporarily and cause another to run. */
SleepEx (0, false); SleepEx (0, false);
SetThreadPriority (GetCurrentThread (), prio);
} }
SetThreadPriority (GetCurrentThread (), prio);
} }
/* Get a default value for the nice factor. When changing these values, /* Get a default value for the nice factor. When changing these values,