Auto merge of rust-lang#3568 - RalfJung:pthread-thread_t, r=RalfJung

unix/thread: properly use pthread_t for thread IDs

This makes basic concurrency work on Solarish.

src/tools/miri/ci/ci.sh

@@ -146,7 +146,7 @@ case $HOST_TARGET in
     MIRI_TEST_TARGET=x86_64-unknown-freebsd run_tests_minimal $BASIC panic/panic concurrency/simple atomic threadname libc-getentropy libc-getrandom libc-misc fs env num_cpus
     MIRI_TEST_TARGET=i686-unknown-freebsd   run_tests_minimal $BASIC panic/panic concurrency/simple atomic threadname libc-getentropy libc-getrandom libc-misc fs env num_cpus
     MIRI_TEST_TARGET=aarch64-linux-android  run_tests_minimal $VERY_BASIC hello panic/panic
-    MIRI_TEST_TARGET=x86_64-unknown-illumos run_tests_minimal $VERY_BASIC hello panic/panic pthread-sync
+    MIRI_TEST_TARGET=x86_64-unknown-illumos run_tests_minimal $VERY_BASIC hello panic/panic concurrency/simple pthread-sync
 	# TODO fix solaris stack guard
     # MIRI_TEST_TARGET=x86_64-pc-solaris run_tests_minimal $VERY_BASIC hello panic/panic pthread-sync
     MIRI_TEST_TARGET=wasm32-wasi run_tests_minimal $VERY_BASIC wasm

src/tools/miri/src/shims/unix/thread.rs

@@ -51,7 +51,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
     fn pthread_detach(&mut self, thread: &OpTy<'tcx, Provenance>) -> InterpResult<'tcx, i32> {
         let this = self.eval_context_mut();
 
-        let thread_id = this.read_target_usize(thread)?;
+        let thread_id = this.read_scalar(thread)?.to_int(this.libc_ty_layout("pthread_t").size)?;
         this.detach_thread(
             thread_id.try_into().expect("thread ID should fit in u32"),
             /*allow_terminated_joined*/ false,
@@ -64,7 +64,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
         let this = self.eval_context_mut();
 
         let thread_id = this.get_active_thread();
-        Ok(Scalar::from_target_usize(thread_id.into(), this))
+        Ok(Scalar::from_uint(thread_id.to_u32(), this.libc_ty_layout("pthread_t").size))
     }
 
     /// Set the name of the current thread. `max_name_len` is the maximal length of the name
@@ -77,7 +77,8 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
     ) -> InterpResult<'tcx, Scalar<Provenance>> {
         let this = self.eval_context_mut();
 
-        let thread = ThreadId::try_from(thread.to_target_usize(this)?).unwrap();
+        let thread = thread.to_int(this.libc_ty_layout("pthread_t").size)?;
+        let thread = ThreadId::try_from(thread).unwrap();
         let name = name.to_pointer(this)?;
 
         let name = this.read_c_str(name)?.to_owned();
@@ -100,7 +101,8 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
     ) -> InterpResult<'tcx, Scalar<Provenance>> {
         let this = self.eval_context_mut();
 
-        let thread = ThreadId::try_from(thread.to_target_usize(this)?).unwrap();
+        let thread = thread.to_int(this.libc_ty_layout("pthread_t").size)?;
+        let thread = ThreadId::try_from(thread).unwrap();
         let name_out = name_out.to_pointer(this)?;
         let len = len.to_target_usize(this)?;