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Make fixes and improvements

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- Document more compiler flags
- Expose new __print_maps() api
- Better overflow checking in mmap()
- Improve the shell example somewhat
- Fix minor runtime bugs regarding stacks
- Make kill() on fork()+execve()'d children work
- Support CLONE_CHILD_CLEARTID for proper joining
- Fix recent possible deadlock regression with --ftrace
This commit is contained in:
Justine Tunney 2022-05-19 16:57:49 -07:00
parent 6e52cba37a
commit ec2cb88058
68 changed files with 1211 additions and 431 deletions
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57
libc/intrin/_spinlock_debug_4.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/intrin/kprintf.h"
#include "libc/intrin/lockcmpxchgp.h"
#include "libc/intrin/spinlock.h"
#include "libc/nexgen32e/rdtsc.h"
#include "libc/time/clockstonanos.internal.h"
void _spinlock_debug_4(void *lockptr, const char *lockname, const char *file,
int line, const char *func) {
unsigned i;
uint64_t ts1, ts2;
int me, owner, *lock = lockptr;
me = gettid();
owner = 0;
if (!_lockcmpxchgp(lock, &owner, me)) {
if (owner == me) {
kprintf("%s:%d: warning: lock re-entry on %s in %s()\n", file, line,
lockname, func);
_Exit(1);
}
i = 0;
ts1 = rdtsc();
for (;;) {
owner = 0;
if (_lockcmpxchgp(lock, &owner, me)) break;
ts2 = rdtsc();
if (ClocksToNanos(ts1, ts2) > 1000000000ul) {
ts1 = ts2;
kprintf("%s:%d: warning: slow lock on %s in %s()\n", file, line,
lockname, func);
}
if (++i & 7) {
__builtin_ia32_pause();
} else {
sched_yield();
}
}
}
}