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add on_each_cpu comments

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This was SVN commit r582.
This commit is contained in:
janwas 2004-06-21 14:22:33 +00:00
parent 55f7411ba9
commit 0d4f9b8a00
1 changed files with 6 additions and 2 deletions
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8
source/lib/sysdep/win/wcpu.cpp
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@ -6,6 +6,8 @@
#include "cpu.h"
// helper routine, called by ia32.cpp check_hyperthread
// not possible with POSIX calls.
int on_each_cpu(void(*cb)())
{
const HANDLE hProcess = GetCurrentProcess();
@ -21,15 +23,17 @@ int on_each_cpu(void(*cb)())
for(DWORD cpu_bit = 1; cpu_bit != 0 && cpu_bit <= process_affinity; cpu_bit *= 2)
{
// switch to target CPU (if present in affinity bitmap)
// check if we can switch to target CPU
if(!(process_affinity & cpu_bit))
continue;
// .. and do so.
if(!SetProcessAffinityMask(hProcess, process_affinity))
{
debug_warn("SetProcessAffinityMask failed");
continue;
}
// .. reschedule, to make sure we switch CPUs
// reschedule, to make sure we switch CPUs
Sleep(0);
cb();