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Merge pull request #4219 from unknownbrackets/arm-threads

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Get cpu core count info from /sys where possible
This commit is contained in:
Henrik Rydgård 2013-10-17 02:15:18 -07:00
commit f64b17ab80
1 changed files with 21 additions and 0 deletions
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21
Common/ArmCPUDetect.cpp
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@ -23,6 +23,8 @@
// Only Linux platforms have /proc/cpuinfo
#if !defined(BLACKBERRY) && !defined(IOS) && !defined(__SYMBIAN32__)
const char procfile[] = "/proc/cpuinfo";
// https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-devices-system-cpu
const char syscpupresentfile[] = "/sys/devices/system/cpu/present";
char *GetCPUString()
{
@ -148,6 +150,25 @@ int GetCoreCount()
char buf[1024];
FILE *fp;
fp = fopen(syscpupresentfile, "r");
if (fp)
{
fgets(buf, sizeof(buf), fp);
fclose(fp);
int low, high;
// Technically, this could be "1-2,4,8-23" but for ARM devices that seems unlikely.
int found = sscanf(buf, "%d-%d", &low, &high);
// Only a single number, so just one slot/core (actually threads.)
if (found == 1)
return 1;
if (found == 2)
return high - low + 1;
// Okay, let's fall back.
}
fp = fopen(procfile, "r");
if (!fp)
return 0;