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Support futexes on FreeBSD

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This commit is contained in:
Justine Tunney 2022-10-02 11:56:27 -07:00
parent 795d295590
commit 7549a5755e
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GPG key ID: BE714B4575D6E328
10 changed files with 81 additions and 31 deletions
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58
third_party/nsync/futex.c vendored
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@ -25,7 +25,9 @@
#include "libc/limits.h"
#include "libc/nt/runtime.h"
#include "libc/nt/synchronization.h"
#include "libc/sysv/consts/clock.h"
#include "libc/sysv/consts/futex.h"
#include "libc/thread/freebsd.internal.h"
#include "libc/thread/thread.h"
#include "third_party/nsync/common.internal.h"
#include "third_party/nsync/futex.internal.h"
@ -52,6 +54,14 @@ __attribute__((__constructor__)) static void nsync_futex_init_ (void) {
return;
}
if (IsFreebsd ()) {
FUTEX_IS_SUPPORTED = true;
FUTEX_WAIT_ = FUTEX_WAIT;
FUTEX_PRIVATE_FLAG_ = FUTEX_PRIVATE_FLAG;
FUTEX_TIMEOUT_IS_ABSOLUTE = true;
return;
}
if (!(FUTEX_IS_SUPPORTED = IsLinux () || IsOpenbsd ())) {
// we're using sched_yield() so let's
// avoid needless clock_gettime calls
@ -75,14 +85,14 @@ __attribute__((__constructor__)) static void nsync_futex_init_ (void) {
FUTEX_WAIT_ = FUTEX_WAIT_BITSET | FUTEX_CLOCK_REALTIME;
FUTEX_PRIVATE_FLAG_ = FUTEX_PRIVATE_FLAG;
FUTEX_TIMEOUT_IS_ABSOLUTE = true;
} else if (IsLinux () &&
} else if (!IsTiny () && 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 () &&
(!IsTiny () && IsLinux () &&
!_futex (&x, FUTEX_WAKE_PRIVATE, 1, 0, 0, 0))) {
FUTEX_WAIT_ = FUTEX_WAIT;
FUTEX_PRIVATE_FLAG_ = FUTEX_PRIVATE_FLAG;
@ -92,8 +102,9 @@ __attribute__((__constructor__)) static void nsync_futex_init_ (void) {
}
int nsync_futex_wait_ (int *p, int expect, char pshare, struct timespec *timeout) {
int rc, op;
size_t size;
uint32_t ms;
int rc, op, fop;
if (!FUTEX_IS_SUPPORTED) {
nsync_yield_ ();
@ -105,6 +116,10 @@ int nsync_futex_wait_ (int *p, int expect, char pshare, struct timespec *timeout
}
op = FUTEX_WAIT_;
if (pshare == PTHREAD_PROCESS_PRIVATE) {
op |= FUTEX_PRIVATE_FLAG_;
}
if (NSYNC_FUTEX_WIN32 && IsWindows ()) {
if (timeout) {
ms = _timespec_tomillis (*timeout);
@ -116,10 +131,25 @@ int nsync_futex_wait_ (int *p, int expect, char pshare, struct timespec *timeout
} else {
rc = -GetLastError ();
}
} else {
if (pshare == PTHREAD_PROCESS_PRIVATE) {
op |= FUTEX_PRIVATE_FLAG_;
} else if (IsFreebsd ()) {
struct _umtx_time *put, ut;
if (!timeout) {
put = 0;
size = 0;
} else {
ut._flags = UMTX_ABSTIME;
ut._clockid = CLOCK_REALTIME;
ut._timeout = *timeout;
put = &ut;
size = sizeof(ut);
}
if (pshare) {
fop = UMTX_OP_WAIT_UINT;
} else {
fop = UMTX_OP_WAIT_UINT_PRIVATE;
}
rc = sys_umtx_op (p, fop, 0, &size, put);
} else {
rc = _futex (p, op, expect, timeout, 0, FUTEX_WAIT_BITS_);
if (IsOpenbsd() && rc > 0) {
// [jart] openbsd does this without setting carry flag
@ -136,7 +166,7 @@ int nsync_futex_wait_ (int *p, int expect, char pshare, struct timespec *timeout
}
int nsync_futex_wake_ (int *p, int count, char pshare) {
int rc, op;
int rc, op, fop;
int wake (void *, int, int) asm ("_futex");
ASSERT (count == 1 || count == INT_MAX);
@ -147,6 +177,10 @@ int nsync_futex_wake_ (int *p, int count, char pshare) {
}
op = FUTEX_WAKE;
if (pshare == PTHREAD_PROCESS_PRIVATE) {
op |= FUTEX_PRIVATE_FLAG_;
}
if (NSYNC_FUTEX_WIN32 && IsWindows ()) {
if (count == 1) {
WakeByAddressSingle (p);
@ -154,10 +188,14 @@ int nsync_futex_wake_ (int *p, int count, char pshare) {
WakeByAddressAll (p);
}
rc = 0;
} else {
if (pshare == PTHREAD_PROCESS_PRIVATE) {
op |= FUTEX_PRIVATE_FLAG_;
} else if (IsFreebsd ()) {
if (pshare) {
fop = UMTX_OP_WAKE;
} else {
fop = UMTX_OP_WAKE_PRIVATE;
}
rc = sys_umtx_op (p, fop, count, 0, 0);
} else {
rc = wake (p, op, count);
}