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feat: IO.getTID #6049

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merged 6 commits into from
Nov 16, 2024
Merged

feat: IO.getTID #6049

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3029ba3
feat: IO.getTID
Kha Sep 10, 2024
cb8e0a4
work around `gettid` not being available on glibc 2.27 and macOS
Kha Oct 28, 2024
d3513d8
use gettid on Linux after all, via syscall()
Kha Nov 12, 2024
64246fe
assert error code
Kha Nov 14, 2024
0a1c5a5
fix Windows
Kha Nov 16, 2024
9c9b808
fix Emscripten
Kha Nov 16, 2024
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3 changes: 3 additions & 0 deletions src/Init/System/IO.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -802,6 +802,9 @@ def run (args : SpawnArgs) : IO String := do

end Process

/-- Returns the thread ID of the calling thread. -/
@[extern "lean_io_get_tid"] opaque getTID : BaseIO UInt64

structure AccessRight where
read : Bool := false
write : Bool := false
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22 changes: 22 additions & 0 deletions src/runtime/process.cpp
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Expand Up @@ -27,6 +27,10 @@ Author: Jared Roesch
#include <limits.h> // NOLINT
#endif

#ifdef __linux
#include <sys/syscall.h>
#endif

#include "runtime/object.h"
#include "runtime/io.h"
#include "runtime/array_ref.h"
Expand Down Expand Up @@ -80,6 +84,10 @@ extern "C" LEAN_EXPORT obj_res lean_io_process_get_pid(obj_arg) {
return lean_io_result_mk_ok(box_uint32(GetCurrentProcessId()));
}

extern "C" LEAN_EXPORT obj_res lean_io_get_tid(obj_arg) {
return lean_io_result_mk_ok(box_uint64(GetCurrentThreadId()));
}

extern "C" LEAN_EXPORT obj_res lean_io_process_child_wait(b_obj_arg, b_obj_arg child, obj_arg) {
HANDLE h = static_cast<HANDLE>(lean_get_external_data(cnstr_get(child, 3)));
DWORD exit_code;
Expand Down Expand Up @@ -316,6 +324,20 @@ extern "C" LEAN_EXPORT obj_res lean_io_process_get_pid(obj_arg) {
return lean_io_result_mk_ok(box_uint32(getpid()));
}

extern "C" LEAN_EXPORT obj_res lean_io_get_tid(obj_arg) {
uint64_t tid;
#ifdef __APPLE__
lean_always_assert(pthread_threadid_np(NULL, &tid) == 0);
#elif defined(LEAN_EMSCRIPTEN)
tid = 0;
#else
// since Linux 2.4.11, our glibc 2.27 requires at least 3.2
// glibc 2.30 would provide a wrapper
tid = (pid_t)syscall(SYS_gettid);
#endif
return lean_io_result_mk_ok(box_uint64(tid));
}

extern "C" LEAN_EXPORT obj_res lean_io_process_child_wait(b_obj_arg, b_obj_arg child, obj_arg) {
static_assert(sizeof(pid_t) == sizeof(uint32), "pid_t is expected to be a 32-bit type"); // NOLINT
pid_t pid = cnstr_get_uint32(child, 3 * sizeof(object *));
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