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Add some more necessary locks

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This commit is contained in:
Justine Tunney 2022-06-12 22:20:59 -07:00
parent 8b72490431
commit 91953dd308
9 changed files with 29 additions and 15 deletions
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5
libc/dns/getresolvconf.c
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@ -20,6 +20,7 @@
#include "libc/dce.h"
#include "libc/dns/resolvconf.h"
#include "libc/fmt/fmt.h"
#include "libc/intrin/pthread.h"
#include "libc/macros.internal.h"
#include "libc/runtime/runtime.h"
#include "libc/sock/sock.h"
@ -28,17 +29,20 @@
static struct ResolvConf *g_resolvconf;
static struct ResolvConfInitialStaticMemory {
struct ResolvConf rv;
pthread_mutex_t lock;
struct sockaddr_in nameservers[3];
} g_resolvconf_init;
/**
* Returns singleton with DNS server address.
* @threadsafe
*/
const struct ResolvConf *GetResolvConf(void) {
int rc;
FILE *f;
struct ResolvConfInitialStaticMemory *init;
init = &g_resolvconf_init;
pthread_mutex_lock(&init->lock);
if (!g_resolvconf) {
g_resolvconf = &init->rv;
pushmov(&init->rv.nameservers.n, ARRAYLEN(init->nameservers));
@ -58,5 +62,6 @@ const struct ResolvConf *GetResolvConf(void) {
/* TODO(jart): Elevate robustness. */
}
}
pthread_mutex_unlock(&init->lock);
return g_resolvconf;
}