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Improve the affinity system calls

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Justine Tunney 2022-10-06 15:08:29 -07:00
parent 60b68d7152
commit 59ac141e49
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GPG key ID: BE714B4575D6E328
19 changed files with 231 additions and 123 deletions
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55
libc/thread/pthread_getaffinity_np.c
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@ -16,30 +16,57 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/sched-sysv.internal.h"
#include "libc/calls/struct/cpuset.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/describeflags.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/str/str.h"
#include "libc/sysv/errfuns.h"
#include "libc/thread/posixthread.internal.h"
/**
* Gets CPU affinity for thread.
*
* While Windows allows us to change the thread affinity mask, it's only
* possible to read the process affinity mask. Therefore this function
* won't reflect the changes made by psched_setaffinity_np() on Windows.
*
* @param bitsetsize is byte length of bitset, which should be 128
* @param size is bytes in bitset, which should be `sizeof(cpu_set_t)`
* @return 0 on success, or errno on error
* @raise ENOSYS if not Linux or Windows
* @raise EINVAL if `size` or `bitset` is invalid
* @raise ENOSYS if not Linux, FreeBSD, or NetBSD
*/
errno_t pthread_getaffinity_np(pthread_t thread, size_t bitsetsize,
errno_t pthread_getaffinity_np(pthread_t thread, size_t size,
cpu_set_t *bitset) {
int rc, e = errno;
struct PosixThread *pt = (struct PosixThread *)thread;
if (!sched_getaffinity(pt->tid, bitsetsize, bitset)) {
return 0;
int tid, rc, e = errno;
tid = ((struct PosixThread *)thread)->tid;
if (size != sizeof(cpu_set_t)) {
rc = einval();
} else if (IsWindows() || IsMetal() || IsOpenbsd()) {
rc = enosys();
} else if (IsFreebsd()) {
if (!sys_sched_getaffinity_freebsd(CPU_LEVEL_WHICH, CPU_WHICH_TID, tid, 32,
bitset)) {
rc = 32;
} else {
rc = -1;
}
} else if (IsNetbsd()) {
if (!sys_sched_getaffinity_netbsd(tid, 0, 32, bitset)) {
rc = 32;
} else {
rc = -1;
}
} else {
rc = errno;
errno = e;
return rc;
rc = sys_sched_getaffinity(tid, size, bitset);
}
if (rc > 0) {
if (rc < size) {
bzero((char *)bitset + rc, size - rc);
}
rc = 0;
}
STRACE("pthread_getaffinity_np(%d, %'zu, %p) → %s", tid, size, bitset,
DescribeErrnoResult(rc));
return rc;
}