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autocommit 2022-04-29 17:35:55 CEST

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This commit is contained in:
Julian Orth 2022-04-29 17:35:55 +02:00
parent aba40dc773
commit 9a0bfb3a72
2 changed files with 20 additions and 24 deletions
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37
src/clientmem.rs
View file

@ -1,6 +1,6 @@
use {
std::{
cell::{Cell, UnsafeCell},
cell::Cell,
mem::MaybeUninit,
ptr,
rc::Rc,
@ -82,21 +82,19 @@ impl ClientMemOffset {
if self.mem.sigbus_impossible {
return Ok(f(&*self.data));
}
MEM.with(|m| {
let mref = MemRef {
mem: &*self.mem,
outer: *m.get(),
};
*m.get() = &mref;
compiler_fence(Ordering::SeqCst);
let res = f(&*self.data);
*m.get() = mref.outer;
compiler_fence(Ordering::SeqCst);
match self.mem.failed.get() {
true => Err(ClientMemError::Sigbus),
_ => Ok(res),
}
})
let mref = MemRef {
mem: &*self.mem,
outer: MEM,
};
MEM = &mref;
compiler_fence(Ordering::SeqCst);
let res = f(&*self.data);
MEM = mref.outer;
compiler_fence(Ordering::SeqCst);
match self.mem.failed.get() {
true => Err(ClientMemError::Sigbus),
_ => Ok(res),
}
}
}
}
@ -114,9 +112,8 @@ struct MemRef {
outer: *const MemRef,
}
thread_local! {
static MEM: UnsafeCell<*const MemRef> = UnsafeCell::new(ptr::null());
}
#[thread_local]
static mut MEM: *const MemRef = ptr::null();
unsafe fn kill() -> ! {
c::signal(c::SIGBUS, c::SIG_DFL);
@ -126,7 +123,7 @@ unsafe fn kill() -> ! {
unsafe extern "C" fn sigbus(sig: i32, info: &c::siginfo_t, _ucontext: *mut c::c_void) {
assert_eq!(sig, c::SIGBUS);
let mut memr_ptr = MEM.with(|m| ptr::read(m.get()));
let mut memr_ptr = MEM;
while !memr_ptr.is_null() {
let memr = &*memr_ptr;
let mem = &*memr.mem;