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Applied patch from Mark Armstrong <marka@availsolutions.com>

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Allows you to set a thread priority under Linux.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16029 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Julian Smart
2002-07-04 09:04:17 +00:00
parent 3eb221f6dd
commit 7bfe6a32e0
1 changed files with 43 additions and 0 deletions
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43
src/unix/threadpsx.cpp
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@@ -53,6 +53,9 @@
// we use wxFFile under Linux in GetCPUCount()
#ifdef __LINUX__
#include "wx/ffile.h"
// For setpriority.
#include <sys/time.h>
#include <sys/resource.h>
#endif
// ----------------------------------------------------------------------------
@@ -1172,6 +1175,45 @@ void wxThread::SetPriority(unsigned int prio)
case STATE_RUNNING:
case STATE_PAUSED:
#ifdef HAVE_THREAD_PRIORITY_FUNCTIONS
#if defined(__LINUX__)
// On Linux, pthread_setschedparam with SCHED_OTHER does not allow
// a priority other than 0. Instead, we use the BSD setpriority
// which alllows us to set a 'nice' value between 20 to -20. Only
// super user can set a value less than zero (more negative yields
// higher priority). setpriority set the static priority of a process,
// but this is OK since Linux is configured as a thread per process.
{
float fPrio;
float pSpan;
int iPrio;
// Map Wx priorites (WXTHREAD_MIN_PRIORITY -
// WXTHREAD_MAX_PRIORITY) into BSD priorities (20 - -20).
// Do calculation of values instead of hard coding them
// to make maintenance easier.
pSpan = ((float)(WXTHREAD_MAX_PRIORITY - WXTHREAD_MIN_PRIORITY)) / 2.0;
// prio starts as ................... // value => (0) >= p <= (n)
fPrio = ((float)prio) - pSpan; // value => (-n) >= p <= (+n)
fPrio = 0.0 - fPrio; // value => (+n) <= p >= (-n)
fPrio = fPrio * (20. / pSpan) + .5; // value => (20) <= p >= (-20)
iPrio = (int)fPrio;
// Clamp prio from 20 - -20;
iPrio = (iPrio > 20) ? 20 : iPrio;
iPrio = (iPrio < -20) ? -20 : iPrio;
if (setpriority(PRIO_PROCESS, 0, iPrio) == -1)
{
wxLogError(_("Failed to set thread priority %d."), prio);
}
}
#else // __LINUX__
{
struct sched_param sparam;
sparam.sched_priority = prio;
@@ -1182,6 +1224,7 @@ void wxThread::SetPriority(unsigned int prio)
wxLogError(_("Failed to set thread priority %d."), prio);
}
}
#endif // __LINUX__
#endif // HAVE_THREAD_PRIORITY_FUNCTIONS
break;