forked from OSchip/llvm-project
107 lines
3.2 KiB
C++
107 lines
3.2 KiB
C++
//===-- Condition.cpp -------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include <errno.h>
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#include "lldb/Host/Condition.h"
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#include "lldb/Host/TimeValue.h"
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using namespace lldb_private;
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//----------------------------------------------------------------------
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// Default constructor
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//
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// The default constructor will initialize a new pthread condition
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// and maintain the condition in the object state.
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//----------------------------------------------------------------------
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Condition::Condition () :
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m_condition()
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{
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::pthread_cond_init (&m_condition, NULL);
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}
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//----------------------------------------------------------------------
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// Destructor
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//
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// Destroys the pthread condition that the object owns.
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//----------------------------------------------------------------------
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Condition::~Condition ()
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{
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::pthread_cond_destroy (&m_condition);
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}
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//----------------------------------------------------------------------
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// Unblock all threads waiting for a condition variable
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//----------------------------------------------------------------------
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int
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Condition::Broadcast ()
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{
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return ::pthread_cond_broadcast (&m_condition);
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}
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//----------------------------------------------------------------------
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// Get accessor to the pthread condition object
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//----------------------------------------------------------------------
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pthread_cond_t *
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Condition::GetCondition ()
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{
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return &m_condition;
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}
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//----------------------------------------------------------------------
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// Unblocks one thread waiting for the condition variable
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//----------------------------------------------------------------------
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int
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Condition::Signal ()
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{
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return ::pthread_cond_signal (&m_condition);
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}
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//----------------------------------------------------------------------
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// The Wait() function atomically blocks the current thread
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// waiting on the owned condition variable, and unblocks the mutex
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// specified by "mutex". The waiting thread unblocks only after
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// another thread calls Signal(), or Broadcast() with the same
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// condition variable, or if "abstime" is valid (non-NULL) this
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// function will return when the system time reaches the time
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// specified in "abstime". If "abstime" is NULL this function will
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// wait for an infinite amount of time for the condition variable
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// to be signaled or broadcasted.
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//
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// The current thread re-acquires the lock on "mutex".
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//----------------------------------------------------------------------
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int
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Condition::Wait (pthread_mutex_t *mutex, const TimeValue *abstime, bool *timed_out)
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{
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int err = 0;
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do
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{
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if (abstime && abstime->IsValid())
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{
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struct timespec abstime_ts = abstime->GetAsTimeSpec();
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err = ::pthread_cond_timedwait (&m_condition, mutex, &abstime_ts);
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}
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else
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err = ::pthread_cond_wait (&m_condition, mutex);
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} while (err == EINTR);
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if (timed_out != NULL)
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{
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if (err == ETIMEDOUT)
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*timed_out = true;
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else
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*timed_out = false;
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}
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return err;
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}
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