libc/src/__support/OSUtil/gpu/quick_exit.cpp

   1 //===---------- GPU implementation of a quick exit function -----*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef LLVM_LIBC_SRC_SUPPORT_OSUTIL_GPU_QUICK_EXIT_H
  10 #define LLVM_LIBC_SRC_SUPPORT_OSUTIL_GPU_QUICK_EXIT_H
  11
  12 #include "quick_exit.h"
  13
  14 #include "src/__support/RPC/rpc_client.h"
  15 #include "src/__support/macros/properties/architectures.h"
  16
  17 namespace __llvm_libc {
  18
  19 void quick_exit(int status) {
  20   // We want to first make sure the server is listening before we exit.
  21   rpc::Client::Port port = rpc::client.open<RPC_EXIT>();
  22   port.send_and_recv([](rpc::Buffer *) {}, [](rpc::Buffer *) {});
  23   port.send([&](rpc::Buffer *buffer) {
  24     reinterpret_cast<uint32_t *>(buffer->data)[0] = status;
  25   });
  26   port.close();
  27
  28 #if defined(LIBC_TARGET_ARCH_IS_NVPTX)
  29   LIBC_INLINE_ASM("exit;" ::: "memory");
  30 #elif defined(LIBC_TARGET_ARCH_IS_AMDGPU)
  31   // This will terminate the entire wavefront, may not be valid with divergent
  32   // work items.
  33   __builtin_amdgcn_endpgm();
  34 #endif
  35   __builtin_unreachable();
  36 }
  37
  38 } // namespace __llvm_libc
  39
  40 #endif // LLVM_LIBC_SRC_SUPPORT_OSUTIL_GPU_QUICK_EXIT_H