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| author | Anton Khirnov <anton@khirnov.net> | 2013-05-23 08:59:07 +0200 |
|---|---|---|
| committer | Anton Khirnov <anton@khirnov.net> | 2013-05-24 09:28:00 +0200 |
| commit | 2a6eaeaa85d17b27ee0dd449183ec197c35c9675 (patch) | |
| tree | fe70d509dde284b0b625465ca6e81f4d72a30c4b /libavutil/cpu.c | |
| parent | 90f9a5830b5d332de7ebb1ab45589f1870cbd65d (diff) | |
| download | ffmpeg-2a6eaeaa85d17b27ee0dd449183ec197c35c9675.tar.gz | |
Move get_logical_cpus() from lavc/pthread to lavu/cpu.
It will be useful in lavfi, and could conceivably be useful to the user
applications as well.
Diffstat (limited to 'libavutil/cpu.c')
| -rw-r--r-- | libavutil/cpu.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/libavutil/cpu.c b/libavutil/cpu.c index 23016d68a9..b95158b054 100644 --- a/libavutil/cpu.c +++ b/libavutil/cpu.c @@ -20,6 +20,24 @@ #include "config.h" #include "opt.h" +#if HAVE_SCHED_GETAFFINITY +#define _GNU_SOURCE +#include <sched.h> +#endif +#if HAVE_GETPROCESSAFFINITYMASK +#include <windows.h> +#endif +#if HAVE_SYSCTL +#if HAVE_SYS_PARAM_H +#include <sys/param.h> +#endif +#include <sys/types.h> +#include <sys/sysctl.h> +#endif +#if HAVE_SYSCONF +#include <unistd.h> +#endif + static int cpuflags_mask = -1, checked; int av_get_cpu_flags(void) @@ -109,6 +127,39 @@ int av_parse_cpu_flags(const char *s) return flags & INT_MAX; } +int av_cpu_count(void) +{ + int ret, nb_cpus = 1; +#if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT) + cpu_set_t cpuset; + + CPU_ZERO(&cpuset); + + ret = sched_getaffinity(0, sizeof(cpuset), &cpuset); + if (!ret) { + nb_cpus = CPU_COUNT(&cpuset); + } +#elif HAVE_GETPROCESSAFFINITYMASK + DWORD_PTR proc_aff, sys_aff; + ret = GetProcessAffinityMask(GetCurrentProcess(), &proc_aff, &sys_aff); + if (ret) + nb_cpus = av_popcount64(proc_aff); +#elif HAVE_SYSCTL && defined(HW_NCPU) + int mib[2] = { CTL_HW, HW_NCPU }; + size_t len = sizeof(nb_cpus); + + ret = sysctl(mib, 2, &nb_cpus, &len, NULL, 0); + if (ret == -1) + nb_cpus = 0; +#elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN) + nb_cpus = sysconf(_SC_NPROC_ONLN); +#elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN) + nb_cpus = sysconf(_SC_NPROCESSORS_ONLN); +#endif + + return nb_cpus; +} + #ifdef TEST #include <stdio.h> |