1#if defined(_REENTRANT)
 2#include <stdatomic.h>
 3extern void __wasi_init_tp(void);
 4#endif
 5extern void __wasm_call_ctors(void);
 6
 7__attribute__((export_name("_initialize")))
 8void _initialize(void) {
 9#if defined(_REENTRANT)
10    static volatile atomic_int initialized = 0;
11    int expected = 0;
12    if (!atomic_compare_exchange_strong(&initialized, &expected, 1)) {
13        __builtin_trap();
14    }
15
16    __wasi_init_tp();
17#else
18    static volatile int initialized = 0;
19    if (initialized != 0) {
20        __builtin_trap();
21    }
22    initialized = 1;
23#endif
24
25    // The linker synthesizes this to call constructors.
26    __wasm_call_ctors();
27}