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#include <stdlib.h>
#include <stdio.h>
#include "jv_alloc.h"
struct nomem_handler {
jv_nomem_handler_f handler;
void *data;
};
#if !defined(HAVE_PTHREAD_KEY_CREATE) || \
!defined(HAVE_PTHREAD_ONCE) || \
!defined(HAVE_ATEXIT)
/* Try thread-local storage? */
#ifdef _MSC_VER
/* Visual C++: yes */
static __declspec(thread) struct nomem_handler nomem_handler;
#define USE_TLS
#else
#ifdef HAVE___THREAD
/* GCC and friends: yes */
static __thread struct nomem_handler nomem_handler;
#define USE_TLS
#endif /* HAVE___THREAD */
#endif /* _MSC_VER */
#endif /* !HAVE_PTHREAD_KEY_CREATE */
#ifdef USE_TLS
void jv_nomem_handler(jv_nomem_handler_f handler, void *data) {
nomem_handler.handler = handler;
}
static void memory_exhausted() {
if (nomem_handler.handler)
nomem_handler.handler(nomem_handler.data); // Maybe handler() will longjmp() to safety
// Or not
fprintf(stderr, "error: cannot allocate memory\n");
abort();
}
#else /* USE_TLS */
#ifdef HAVE_PTHREAD_KEY_CREATE
#include <pthread.h>
pthread_key_t nomem_handler_key;
pthread_once_t mem_once = PTHREAD_ONCE_INIT;
static void tsd_fini(void) {
struct nomem_handler *nomem_handler;
nomem_handler = pthread_getspecific(nomem_handler_key);
if (nomem_handler) {
(void) pthread_setspecific(nomem_handler_key, NULL);
free(nomem_handler);
}
}
static void tsd_init(void) {
if (pthread_key_create(&nomem_handler_key, NULL) != 0) {
fprintf(stderr, "error: cannot create thread specific key");
abort();
}
if (atexit(tsd_fini) != 0) {
fprintf(stderr, "error: cannot set an exit handler");
abort();
}
struct nomem_handler *nomem_handler = calloc(1, sizeof(struct nomem_handler));
if (pthread_setspecific(nomem_handler_key, nomem_handler) != 0) {
fprintf(stderr, "error: cannot set thread specific data");
abort();
}
}
void jv_nomem_handler(jv_nomem_handler_f handler, void *data) {
pthread_once(&mem_once, tsd_init); // cannot fail
struct nomem_handler *nomem_handler;
nomem_handler = pthread_getspecific(nomem_handler_key);
if (nomem_handler == NULL) {
handler(data);
fprintf(stderr, "error: cannot allocate memory\n");
abort();
}
nomem_handler->handler = handler;
nomem_handler->data = data;
}
static void memory_exhausted() {
struct nomem_handler *nomem_handler;
pthread_once(&mem_once, tsd_init);
nomem_handler = pthread_getspecific(nomem_handler_key);
if (nomem_handler)
nomem_handler->handler(nomem_handler->data); // Maybe handler() will longjmp() to safety
// Or not
fprintf(stderr, "error: cannot allocate memory\n");
abort();
}
#else
/* No thread-local storage of any kind that we know how to handle */
static struct nomem_handler nomem_handler;
void jv_nomem_handler(jv_nomem_handler_f handler, void *data) {
nomem_handler.handler = handler;
nomem_handler.data = data;
}
static void memory_exhausted() {
fprintf(stderr, "error: cannot allocate memory\n");
abort();
}
#endif /* HAVE_PTHREAD_KEY_CREATE */
#endif /* USE_TLS */
void* jv_mem_alloc(size_t sz) {
void* p = malloc(sz);
if (!p) {
memory_exhausted();
}
return p;
}
void* jv_mem_alloc_unguarded(size_t sz) {
return malloc(sz);
}
void jv_mem_free(void* p) {
free(p);
}
void* jv_mem_realloc(void* p, size_t sz) {
p = realloc(p, sz);
if (!p) {
memory_exhausted();
}
return p;
}
#ifndef NDEBUG
volatile char jv_mem_uninitialised;
__attribute__((constructor)) void jv_mem_uninit_setup(){
char* p = malloc(1);
jv_mem_uninitialised = *p;
free(p);
}
#endif
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