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Add *NSYNC to libc/isystem

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Justine Tunney 2022-09-13 01:46:29 -07:00
parent 6f7d0cb1c3
commit 22b63d0b98
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GPG key ID: BE714B4575D6E328
32 changed files with 286 additions and 119 deletions
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44
third_party/nsync/futex.c vendored
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@ -16,11 +16,11 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/intrin/strace.internal.h"
#include "libc/calls/struct/timespec.internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/describeflags.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/sysv/consts/futex.h"
#include "libc/thread/thread.h"
#include "third_party/nsync/common.internal.h"
@ -34,30 +34,15 @@
int _futex (int *, int, int, const struct timespec *, int *, int);
static int FUTEX_WAIT_;
static int FUTEX_WAKE_;
static int FUTEX_PRIVATE_FLAG_;
static bool FUTEX_IS_SUPPORTED;
bool FUTEX_TIMEOUT_IS_ABSOLUTE;
__attribute__((__constructor__)) static void sync_futex_init_ (void) {
__attribute__((__constructor__)) static void nsync_futex_init_ (void) {
int x = 0;
FUTEX_WAKE_ = FUTEX_WAKE;
if (IsLinux () &&
_futex (&x, FUTEX_WAIT_BITSET, 1, 0, 0,
FUTEX_BITSET_MATCH_ANY) == -EAGAIN) {
FUTEX_WAIT_ = FUTEX_WAIT_BITSET;
FUTEX_TIMEOUT_IS_ABSOLUTE = true;
} else {
FUTEX_WAIT_ = FUTEX_WAIT;
}
if (IsOpenbsd () ||
(IsLinux () &&
!_futex (&x, FUTEX_WAKE_PRIVATE, 1, 0, 0, 0))) {
FUTEX_PRIVATE_FLAG_ = FUTEX_PRIVATE_FLAG;
}
if (!(FUTEX_IS_SUPPORTED = IsLinux() || IsOpenbsd()))
return;
// In our testing, we found that the monotonic clock on various
// popular systems (such as Linux, and some BSD variants) was no
@ -72,10 +57,23 @@ __attribute__((__constructor__)) static void sync_futex_init_ (void) {
if (IsLinux () &&
_futex (&x, FUTEX_WAIT_BITSET | FUTEX_CLOCK_REALTIME,
1, 0, 0, FUTEX_BITSET_MATCH_ANY) == -EAGAIN) {
FUTEX_WAIT_ |= FUTEX_CLOCK_REALTIME;
FUTEX_WAIT_ = FUTEX_WAIT_BITSET | FUTEX_CLOCK_REALTIME;
FUTEX_PRIVATE_FLAG_ = FUTEX_PRIVATE_FLAG;
FUTEX_TIMEOUT_IS_ABSOLUTE = true;
} else if (IsLinux () &&
_futex (&x, FUTEX_WAIT_BITSET, 1, 0, 0,
FUTEX_BITSET_MATCH_ANY) == -EAGAIN) {
FUTEX_WAIT_ = FUTEX_WAIT_BITSET;
FUTEX_PRIVATE_FLAG_ = FUTEX_PRIVATE_FLAG;
FUTEX_TIMEOUT_IS_ABSOLUTE = true;
} else if (IsOpenbsd () ||
(IsLinux () &&
!_futex (&x, FUTEX_WAKE_PRIVATE, 1, 0, 0, 0))) {
FUTEX_WAIT_ = FUTEX_WAIT;
FUTEX_PRIVATE_FLAG_ = FUTEX_PRIVATE_FLAG;
} else {
FUTEX_WAIT_ = FUTEX_WAIT;
}
FUTEX_IS_SUPPORTED = IsLinux() || IsOpenbsd();
}
int nsync_futex_wait_ (int *p, int expect, char pshare, struct timespec *timeout) {
@ -108,7 +106,7 @@ int nsync_futex_wake_ (int *p, int count, char pshare) {
int rc, op;
int wake (void *, int, int) asm ("_futex");
if (FUTEX_IS_SUPPORTED) {
op = FUTEX_WAKE_;
op = FUTEX_WAKE;
if (pshare == PTHREAD_PROCESS_PRIVATE) {
op |= FUTEX_PRIVATE_FLAG_;
}