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//! The functions in this module are needed by libunwind. These symbols are named
//! in pre-link args for the target specification, so keep that in sync.
#![cfg(not(test))]
use crate::sys::sync::RwLock;
// Verify that the byte pattern libunwind uses to initialize an RwLock is
// equivalent to the value of RwLock::new(). If the value changes,
// `src/UnwindRustSgx.h` in libunwind needs to be changed too.
const _: () = unsafe {
let bits_rust: usize = crate::mem::transmute(RwLock::new());
assert!(bits_rust == 0);
};
const EINVAL: i32 = 22;
#[no_mangle]
pub unsafe extern "C" fn __rust_rwlock_rdlock(p: *mut RwLock) -> i32 {
if p.is_null() {
return EINVAL;
}
// We cannot differentiate between reads an writes in unlock and therefore
// always use a write-lock. Unwinding isn't really in the hot path anyway.
unsafe { (*p).write() };
return 0;
}
#[no_mangle]
pub unsafe extern "C" fn __rust_rwlock_wrlock(p: *mut RwLock) -> i32 {
if p.is_null() {
return EINVAL;
}
unsafe { (*p).write() };
return 0;
}
#[no_mangle]
pub unsafe extern "C" fn __rust_rwlock_unlock(p: *mut RwLock) -> i32 {
if p.is_null() {
return EINVAL;
}
unsafe { (*p).write_unlock() };
return 0;
}
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