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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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51
libc/thread/pthread_setaffinity_np.c
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@ -16,26 +16,61 @@
│ 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/calls/syscall_support-nt.internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/describeflags.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/nt/enum/threadaccess.h"
#include "libc/nt/runtime.h"
#include "libc/nt/thread.h"
#include "libc/sysv/errfuns.h"
#include "libc/thread/posixthread.internal.h"
static dontinline textwindows int sys_pthread_setaffinity_nt(
int tid, uint64_t size, const cpu_set_t *bitset) {
int rc;
int64_t h;
h = OpenThread(kNtThreadSetInformation | kNtThreadQueryInformation, false,
tid);
if (!h) return __winerr();
rc = SetThreadAffinityMask(h, bitset->__bits[0]) ? 0 : __winerr();
CloseHandle(h);
return rc;
}
/**
* Asks kernel to only schedule thread on particular CPUs.
*
* @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, NetBSD, or Windows
* @see sched_setaffinity() for processes
*/
errno_t pthread_setaffinity_np(pthread_t thread, size_t bitsetsize,
errno_t pthread_setaffinity_np(pthread_t thread, size_t size,
const cpu_set_t *bitset) {
int rc, e = errno;
struct PosixThread *pt = (struct PosixThread *)thread;
if (!sched_setaffinity(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()) {
rc = sys_pthread_setaffinity_nt(tid, size, bitset);
} else if (IsFreebsd()) {
rc = sys_sched_setaffinity_freebsd(CPU_LEVEL_WHICH, CPU_WHICH_TID, tid, 32,
bitset);
} else if (IsNetbsd()) {
rc = sys_sched_setaffinity_netbsd(tid, 0, 32, bitset);
} else {
rc = sys_sched_setaffinity(tid, size, bitset);
}
if (rc == -1) {
rc = errno;
errno = e;
return rc;
}
STRACE("pthread_setaffinity_np(%d, %'zu, %p) → %s", tid, size, bitset,
DescribeErrnoResult(rc));
return rc;
}