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//===-- A platform independent abstraction layer for cond vars --*- 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___SUPPORT_SRC_THREADS_LINUX_CNDVAR_H
#define LLVM_LIBC___SUPPORT_SRC_THREADS_LINUX_CNDVAR_H
#include "hdr/stdint_proxy.h" // uint32_t
#include "src/__support/macros/config.h"
#include "src/__support/threads/linux/futex_utils.h" // Futex
#include "src/__support/threads/mutex.h" // Mutex
#include "src/__support/threads/raw_mutex.h" // RawMutex
namespace LIBC_NAMESPACE_DECL {
class CndVar {
enum CndWaiterStatus : uint32_t {
WS_Waiting = 0xE,
WS_Signalled = 0x5,
};
struct CndWaiter {
Futex futex_word = WS_Waiting;
CndWaiter *next = nullptr;
};
CndWaiter *waitq_front;
CndWaiter *waitq_back;
RawMutex qmtx;
public:
LIBC_INLINE static int init(CndVar *cv) {
cv->waitq_front = cv->waitq_back = nullptr;
RawMutex::init(&cv->qmtx);
return 0;
}
LIBC_INLINE static void destroy(CndVar *cv) {
cv->waitq_front = cv->waitq_back = nullptr;
}
// Returns 0 on success, -1 on error.
int wait(Mutex *m);
void notify_one();
void broadcast();
};
} // namespace LIBC_NAMESPACE_DECL
#endif // LLVM_LIBC_SRC___SUPPORT_THREADS_LINUX_CNDVAR_H
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