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Make improvements to locking

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This change makes pthread_mutex_lock() as fast as _spinlock() by
default. Thread instability issues on NetBSD have been resolved.
Improvements made to gdtoa thread code. Crash reporting will now
synchronize between threads in a slightly better way.
This commit is contained in:
Justine Tunney 2022-06-19 01:13:03 -07:00
parent 25041b8026
commit d5312b60f7
60 changed files with 890 additions and 629 deletions
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32
libc/log/die.c
View file

@ -16,8 +16,10 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/dce.h"
#include "libc/intrin/lockcmpxchg.h"
#include "libc/intrin/kprintf.h"
#include "libc/intrin/lockcmpxchgp.h"
#include "libc/log/backtrace.internal.h"
#include "libc/log/internal.h"
#include "libc/log/libfatal.internal.h"
@ -32,18 +34,30 @@
*/
relegated wontreturn void __die(void) {
/* asan runtime depends on this function */
int rc;
static bool once;
if (_lockcmpxchg(&once, false, true)) {
int me, owner;
static int sync;
owner = 0;
me = gettid();
if (_lockcmpxchgp(&sync, &owner, me)) {
__restore_tty();
if (IsDebuggerPresent(false)) {
DebugBreak();
}
ShowBacktrace(2, NULL);
rc = 77;
if (weaken(ShowBacktrace)) {
weaken(ShowBacktrace)(2, __builtin_frame_address(0));
} else if (weaken(PrintBacktraceUsingSymbols) && weaken(GetSymbolTable)) {
weaken(PrintBacktraceUsingSymbols)(2, __builtin_frame_address(0),
weaken(GetSymbolTable)());
} else {
kprintf("can't backtrace b/c `ShowCrashReports` not linked\n");
}
__restorewintty();
_Exit(77);
} else if (owner == me) {
kprintf("die failed while dying\n");
__restorewintty();
_Exit(78);
} else {
rc = 78;
_Exit1(79);
}
__restorewintty();
_Exit(rc);
}