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Add some more builtins to chibicc

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https://justine.lol/cosmopolitan/documentation.html should now contain a
lot of functions that had been missing previously due to not having them
This commit is contained in:
Justine Tunney 2022-04-17 12:25:10 -07:00
parent ab38f0823d
commit f1dfa4bdfa
17 changed files with 417 additions and 201 deletions
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84
libc/calls/sigaction.c
View file

@ -292,50 +292,50 @@ static int __sigaction(int sig, const struct sigaction *act,
* have your signals work hand-in-glove with the EINTR errno. This
* obfuscates the need for having to worry about @asyncsignalsafe.
*
* static volatile bool gotctrlc;
* static volatile bool gotctrlc;
*
* void OnCtrlC(int sig) {
* gotctrlc = true;
* }
* void OnCtrlC(int sig) {
* gotctrlc = true;
* }
*
* int main() {
* size_t got;
* ssize_t rc;
* char buf[1];
* struct sigaction oldint;
* struct sigaction saint = {.sa_handler = GotCtrlC};
* if (sigaction(SIGINT, &saint, &oldint) == -1) {
* perror("sigaction");
* exit(1);
* }
* for (;;) {
* rc = read(0, buf, sizeof(buf));
* if (rc == -1) {
* if (errno == EINTR) {
* if (gotctrlc) {
* break;
* }
* } else {
* perror("read");
* exit(2);
* }
* }
* if (!(got = rc)) {
* break;
* }
* for (;;) {
* rc = write(1, buf, got);
* if (rc != -1) {
* assert(rc == 1);
* break;
* } else if (errno != EINTR) {
* perror("write");
* exit(3);
* }
* }
* }
* sigaction(SIGINT, &oldint, 0);
* }
* int main() {
* size_t got;
* ssize_t rc;
* char buf[1];
* struct sigaction oldint;
* struct sigaction saint = {.sa_handler = GotCtrlC};
* if (sigaction(SIGINT, &saint, &oldint) == -1) {
* perror("sigaction");
* exit(1);
* }
* for (;;) {
* rc = read(0, buf, sizeof(buf));
* if (rc == -1) {
* if (errno == EINTR) {
* if (gotctrlc) {
* break;
* }
* } else {
* perror("read");
* exit(2);
* }
* }
* if (!(got = rc)) {
* break;
* }
* for (;;) {
* rc = write(1, buf, got);
* if (rc != -1) {
* assert(rc == 1);
* break;
* } else if (errno != EINTR) {
* perror("write");
* exit(3);
* }
* }
* }
* sigaction(SIGINT, &oldint, 0);
* }
*
* Please note that you can't do the above if you use SA_RESTART. Since
* the purpose of SA_RESTART is to restart i/o operations whose docs say

22
libc/intrin/spinlock.h
View file

@ -4,17 +4,17 @@
#if (__GNUC__ + 0) * 100 + (__GNUC_MINOR__ + 0) >= 401 && \
!defined(__STRICT_ANSI__)
#define _spinlock(lock) \
do { \
for (;;) { \
typeof(*(lock)) x; \
__atomic_load(lock, &x, __ATOMIC_RELAXED); \
if (!x && !__sync_lock_test_and_set(lock, __ATOMIC_CONSUME)) { \
break; \
} else { \
__builtin_ia32_pause(); \
} \
} \
#define _spinlock(lock) \
do { \
for (;;) { \
typeof(*(lock)) x; \
__atomic_load(lock, &x, __ATOMIC_RELAXED); \
if (!x && !__sync_lock_test_and_set(lock, 1)) { \
break; \
} else { \
__builtin_ia32_pause(); \
} \
} \
} while (0)
#define _spunlock(lock) __sync_lock_release(lock)