From 17b117e73df71925d73ee026b4f54aa1867ce0a5 Mon Sep 17 00:00:00 2001
From: Jesse Gilles <jgilles@multitech.com>
Date: Mon, 20 Apr 2015 16:49:52 -0500
Subject: initial commit

---
 src/MTS_Condition.cpp | 115 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 src/MTS_Condition.cpp

(limited to 'src/MTS_Condition.cpp')

diff --git a/src/MTS_Condition.cpp b/src/MTS_Condition.cpp
new file mode 100644
index 0000000..d238d50
--- /dev/null
+++ b/src/MTS_Condition.cpp
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2015 by Multi-Tech Systems
+ *
+ * This file is part of libmts.
+ *
+ * libmts is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * libmts is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with libmts.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <mts/MTS_Condition.h>
+#include <mts/MTS_Lock.h>
+#include <mts/MTS_System.h>
+#include <mts/MTS_Logger.h>
+#include <cassert>
+#include <cerrno>
+#include <stdexcept>
+
+using namespace MTS;
+
+Condition::Condition(Lock* pLock)
+: m_pLock(pLock) {
+    if (pLock == 0) {
+        throw std::invalid_argument("Condition| constructing lock is null");
+    }
+#ifdef WIN32
+    m_apCondition.reset(CreateEvent(NULL, FALSE, FALSE, NULL));
+    if (m_pCondition.get() == NULL) {
+        throw std::bad_alloc();
+    }
+#else
+    m_apCondition.reset(new pthread_cond_t());
+    const uint32_t result = pthread_cond_init(m_apCondition.get(), NULL);
+    if (result != 0) {
+        throw std::runtime_error("Condition| failed to initialize condition");
+    }
+#endif
+}
+
+Condition::~Condition() {
+    if (!m_apCondition.isNull()) {
+#ifdef WIN32
+    const BOOL ok = CloseHandle(m_apCondition.get());
+    assert(ok);
+#else
+    const uint32_t result = pthread_cond_destroy(m_apCondition.get());
+    if (result != 0) {
+        printWarning("Condition| failed to destroy condition");
+    }
+    assert(result == 0);
+#endif
+    }
+}
+
+void Condition::wait() {
+#ifdef WIN32
+    wait(INFINITE);
+#else
+    const uint32_t result = pthread_cond_wait(m_apCondition.get(),
+    m_pLock->m_apMutex.get());
+    if (result != 0) {
+        printWarning("Condition| failed to wait on condition");
+    }
+    assert(result == 0);
+#endif
+}
+
+void Condition::wait(uint32_t millis) {
+    assert(m_pLock->isLocked());
+    if(!m_pLock->isLocked()) {
+        printWarning("Condition| lock was not locked. not waiting on signal.");
+        return;
+    }
+#ifdef WIN32
+    ResetEvent(m_apCondition.get());
+    m_pLock->unlock();
+    const DWORD waitResult = WaitForSingleObject(m_apCondition.get(), millis);
+    assert(waitResult == WAIT_OBJECT_0 || waitResult == WAIT_TIMEOUT);
+    m_pLock->lock();
+#else
+    timespec abstime;
+    int64_t micros = System::timeMicros() + (millis * 1000);
+    abstime.tv_sec = static_cast<long>(micros / 1000000);
+    abstime.tv_nsec = static_cast<long>((micros % 1000000) * 1000);
+    const uint32_t result = pthread_cond_timedwait(m_apCondition.get(),
+    m_pLock->m_apMutex.get(), &abstime);
+    if (result != 0 && result != ETIMEDOUT) {
+        printWarning("Condition| failed to time wait on condition");
+    }
+    assert(result == 0 || result == ETIMEDOUT);
+#endif
+}
+
+void Condition::signal() {
+#ifdef WIN32
+    const BOOL ok = SetEvent(m_apCondition.get());
+    assert(ok);
+#else
+    const uint32_t result = pthread_cond_broadcast(m_apCondition.get());
+    if (result != 0) {
+        printWarning("Condition| failed to signal condition");
+    }
+    assert(result == 0);
+#endif
+}
-- 
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