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Add shared memory apis to redbean

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You can now do things like implement mutexes using futexes in your
redbean lua code. This provides the fastest possible inter-process
communication for your production systems when SQLite alone as ipc
or things like pipes aren't sufficient.
This commit is contained in:
Justine Tunney 2022-10-06 04:55:26 -07:00
parent 81ee11a16e
commit 7822917fc2
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GPG key ID: BE714B4575D6E328
21 changed files with 988 additions and 23 deletions
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11
libc/intrin/extend.c
View file

@ -29,11 +29,11 @@
#define G FRAMESIZE
static void _mapframe(void *p) {
static void _mapframe(void *p, int f) {
int prot, flags;
struct DirectMap dm;
prot = PROT_READ | PROT_WRITE;
flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED;
flags = f | MAP_ANONYMOUS | MAP_FIXED;
if ((dm = sys_mmap(p, G, prot, flags, -1, 0)).addr != p) {
notpossible;
}
@ -60,9 +60,10 @@ static void _mapframe(void *p) {
* @param n specifies how many bytes are needed
* @param e points to end of memory that's allocated
* @param h is highest address to which `e` may grow
* @param f should be `MAP_PRIVATE` or `MAP_SHARED`
* @return new value for `e`
*/
noasan void *_extend(void *p, size_t n, void *e, intptr_t h) {
noasan void *_extend(void *p, size_t n, void *e, int f, intptr_t h) {
char *q;
#ifndef NDEBUG
if ((uintptr_t)SHADOW(p) & (G - 1)) notpossible;
@ -71,10 +72,10 @@ noasan void *_extend(void *p, size_t n, void *e, intptr_t h) {
for (q = e; q < ((char *)p + n); q += 8) {
if (!((uintptr_t)q & (G - 1))) {
if (q + G > (char *)h) notpossible;
_mapframe(q);
_mapframe(q, f);
if (IsAsan()) {
if (!((uintptr_t)SHADOW(q) & (G - 1))) {
_mapframe(SHADOW(q));
_mapframe(SHADOW(q), f);
__asan_poison(q, G << kAsanScale, kAsanProtected);
}
}