是否有可能设置亲和力Android中了sched_setaffinity？ [英] Is it possible to set affinity with sched_setaffinity in Android?

问题描述

是否有可能设置与Android NDK编译本地C code CPU的亲和力？由于系统使用的是Linux内核，它应该是可以使用了sched_setaffinity / sched_getaffinity功能，但是当我用NDK编译，我得到的错误抱怨cpu_set_t类型未知（这是作为参数传递给函数） 。是否有任何其他的方式来做到这一点？当我与codeSourcerys ARM编译器（ARM-NONE-Linux的gnueabi-GCC）编译这似乎并不成为一个问题，因此该系统明显支持所需的系统调用。

Is it possible to set CPU affinity in native C code compiled with the Android NDK? Since the system is using a Linux kernel, it should be possible to use the sched_setaffinity/sched_getaffinity functions, but when I compile with the NDK, I get errors complaining that the cpu_set_t type is unknown (which is used as an argument to the functions). Is there any other way to accomplish this? When I compile with CodeSourcerys ARM compiler (arm-none-linux-gnueabi-gcc) this does not seem to be a problem, so the system obviously supports the required syscalls.

推荐答案

以下code。与NDK R5或行之有效的更新：

The following code works well with NDK r5 or newer:

#include <sys/syscall.h>
#include <pthread.h>
void setCurrentThreadAffinityMask(int mask)
{
    int err, syscallres;
    pid_t pid = gettid();
    syscallres = syscall(__NR_sched_setaffinity, pid, sizeof(mask), &mask);
    if (syscallres)
    {
        err = errno;
        LOGE("Error in the syscall setaffinity: mask=%d=0x%x err=%d=0x%x", mask, mask, err, err);
    }
}

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