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Move get_logical_cpus() from lavc/pthread to lavu/cpu.

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It will be useful in lavfi, and could conceivably be useful to the user
applications as well.
This commit is contained in:
Anton Khirnov 2013-05-23 08:59:07 +02:00
parent 90f9a5830b
commit 2a6eaeaa85
5 changed files with 65 additions and 55 deletions
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3
doc/APIchanges
View File

@ -13,6 +13,9 @@ libavutil: 2012-10-22
API changes, most recent first:
2013-xx-xx - xxxxxxx - lavu 52.12.0 - cpu.h
Add av_cpu_count() function for getting the number of logical CPUs.
2013-05-xx - xxxxxxx - lavc 55.7.0 - avcodec.h
Add picture_structure to AVCodecParserContext.

59
libavcodec/pthread.c
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@ -31,29 +31,12 @@
#include "config.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
#include "avcodec.h"
#include "internal.h"
#include "thread.h"
#include "libavutil/avassert.h"
#include "libavutil/common.h"
#include "libavutil/cpu.h"
#if HAVE_PTHREADS
#include <pthread.h>
@ -153,40 +136,6 @@ typedef struct FrameThreadContext {
* limit the number of threads to 16 for automatic detection */
#define MAX_AUTO_THREADS 16
static int get_logical_cpus(AVCodecContext *avctx)
{
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
av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
return nb_cpus;
}
static void* attribute_align_arg worker(void *v)
{
AVCodecContext *avctx = v;
@ -292,7 +241,8 @@ static int thread_init(AVCodecContext *avctx)
int thread_count = avctx->thread_count;
if (!thread_count) {
int nb_cpus = get_logical_cpus(avctx);
int nb_cpus = av_cpu_count();
av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
// use number of cores + 1 as thread count if there is more than one
if (nb_cpus > 1)
thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
@ -790,7 +740,8 @@ static int frame_thread_init(AVCodecContext *avctx)
int i, err = 0;
if (!thread_count) {
int nb_cpus = get_logical_cpus(avctx);
int nb_cpus = av_cpu_count();
av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
// use number of cores + 1 as thread count if there is more than one
if (nb_cpus > 1)
thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);

51
libavutil/cpu.c
View File

@ -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>

5
libavutil/cpu.h
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@ -76,6 +76,11 @@ void av_set_cpu_flags_mask(int mask);
*/
int av_parse_cpu_flags(const char *s);
/**
* @return the number of logical CPU cores present.
*/
int av_cpu_count(void);
/* The following CPU-specific functions shall not be called directly. */
int ff_get_cpu_flags_arm(void);
int ff_get_cpu_flags_ppc(void);

2
libavutil/version.h
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@ -37,7 +37,7 @@
*/
#define LIBAVUTIL_VERSION_MAJOR 52
#define LIBAVUTIL_VERSION_MINOR 11
#define LIBAVUTIL_VERSION_MINOR 12
#define LIBAVUTIL_VERSION_MICRO 0
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \