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//===-- Shared memory RPC client / server utilities -------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_SRC_SUPPORT_RPC_RPC_UTILS_H
#define LLVM_LIBC_SRC_SUPPORT_RPC_RPC_UTILS_H
#include "src/__support/macros/attributes.h"
#include "src/__support/macros/properties/architectures.h"
namespace __llvm_libc {
namespace rpc {
/// Suspend the thread briefly to assist the thread scheduler during busy loops.
LIBC_INLINE void sleep_briefly() {
#if defined(LIBC_TARGET_ARCH_IS_NVPTX) && __CUDA_ARCH__ >= 700
asm("nanosleep.u32 64;" ::: "memory");
#elif defined(LIBC_TARGET_ARCH_IS_AMDGPU)
__builtin_amdgcn_s_sleep(2);
#else
// Simply do nothing if sleeping isn't supported on this platform.
#endif
}
/// Get the first active thread inside the lane.
LIBC_INLINE uint64_t get_first_lane_id(uint64_t lane_mask) {
return __builtin_ffsl(lane_mask) - 1;
}
/// Conditional that is only true for a single thread in a lane.
LIBC_INLINE bool is_first_lane(uint64_t lane_mask) {
return gpu::get_lane_id() == get_first_lane_id(lane_mask);
}
} // namespace rpc
} // namespace __llvm_libc
#endif
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