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Add missing lock to fork() on Windows

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Justine Tunney 2025-01-03 19:01:58 -08:00
parent e939659b70
commit fe01642a20
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GPG key ID: BE714B4575D6E328
19 changed files with 90 additions and 96 deletions
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27
libc/intrin/msync-nt.c
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@ -19,10 +19,8 @@
#include "libc/calls/syscall-nt.internal.h"
#include "libc/intrin/maps.h"
#include "libc/nt/memory.h"
#include "libc/nt/runtime.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/sysparam.h"
#include "libc/sysv/consts/auxv.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/errfuns.h"
@ -36,28 +34,17 @@ textwindows int sys_msync_nt(char *addr, size_t size, int flags) {
int rc = 0;
__maps_lock();
struct Map *next, *map;
struct Map *map;
if (!(map = __maps_floor(addr)))
map = __maps_first();
for (; map && map->addr <= addr + size; map = next) {
next = __maps_next(map);
if (!__maps_isalloc(map))
continue;
for (; map && map->addr <= addr + size; map = __maps_next(map)) {
if (map->flags & MAP_ANONYMOUS)
continue;
if (MAX(addr, map->addr) >= MIN(addr + size, map->addr + map->size))
continue; // msync() is about coherency between file and memory
char *beg = MAX(addr, map->addr);
char *end = MIN(addr + size, map->addr + map->size);
if (beg >= end)
continue; // didn't overlap mapping
// get true size of win32 allocation
size_t allocsize = map->size;
while (next && !__maps_isalloc(next) &&
next->addr + allocsize == next->addr) {
allocsize += next->size;
next = __maps_next(next);
}
// perform the flush
if (!FlushViewOfFile(map->addr, allocsize))
if (!FlushViewOfFile(beg, end - beg))
rc = -1;
// TODO(jart): FlushFileBuffers too on g_fds handle if MS_SYNC?
}