fix: cr

1. Compile pthread_atfork.c when target contains "android".
2. Use original definition of "pthread_atfork".

Signed-off-by: fys <fengys1996@gmail.com>

Author: fengys1996

jemalloc-sys/build.rs

@@ -339,10 +339,15 @@ fn main() {
     }
     println!("cargo:rerun-if-changed=jemalloc");
 
-    cc::Build::new()
-        .file("src/pthread_atfork.c")
-        .compile("pthread_atfork");
-    println!("cargo:rerun-if-changed=src/pthread_atfork.c");
+    if target.contains("android") {
+        // These symbols are used by jemalloc on android but the really old android
+        // we're building on doesn't have them defined, so just make sure the symbols
+        // are available.
+        cc::Build::new()
+            .file("src/pthread_atfork.c")
+            .compile("pthread_atfork");
+        println!("cargo:rerun-if-changed=src/pthread_atfork.c");
+    }
 }
 
 fn run_and_log(cmd: &mut Command, log_file: &Path) {

jemalloc-sys/src/pthread_atfork.c

@@ -1,11 +1,13 @@
-#include <stdint.h>
+#include <pthread.h>
 
-// These symbols are used by jemalloc on android but the really old android
-// we're building on doesn't have them defined, so just make sure the symbols
-// are available.
+/*
+ * These symbols are used by jemalloc on android but the really old android
+ * we're building on doesn't have them defined, so just make sure the symbols
+ * are available.
+ */
 __attribute__((weak)) int
-pthread_atfork(uint8_t *prefork __attribute__((unused)),
-               uint8_t *postfork_parent __attribute__((unused)),
-               uint8_t *postfork_child __attribute__((unused))) {
+pthread_atfork(void (*prepare)(void) __attribute__((unused)),
+               void (*parent)(void) __attribute__((unused)),
+               void (*child)(void) __attribute__((unused))) {
   return 0;
 }