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<h1>csutil/threading/win32_condition.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> Copyright (C) 2006 by Marten Svanfeldt</span>
<a name="l00003"></a>00003 <span class="comment"></span>
<a name="l00004"></a>00004 <span class="comment"> This library is free software; you can redistribute it and/or</span>
<a name="l00005"></a>00005 <span class="comment"> modify it under the terms of the GNU Lesser General Public</span>
<a name="l00006"></a>00006 <span class="comment"> License as published by the Free Software Foundation; either</span>
<a name="l00007"></a>00007 <span class="comment"> version 2 of the License, or (at your option) any later version.</span>
<a name="l00008"></a>00008 <span class="comment"></span>
<a name="l00009"></a>00009 <span class="comment"> This library is distributed in the hope that it will be useful,</span>
<a name="l00010"></a>00010 <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00011"></a>00011 <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00012"></a>00012 <span class="comment"> Library General Public License for more details.</span>
<a name="l00013"></a>00013 <span class="comment"></span>
<a name="l00014"></a>00014 <span class="comment"> You should have received a copy of the GNU Library General Public</span>
<a name="l00015"></a>00015 <span class="comment"> License along with this library; if not, write to the Free</span>
<a name="l00016"></a>00016 <span class="comment"> Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.</span>
<a name="l00017"></a>00017 <span class="comment">*/</span>
<a name="l00018"></a>00018
<a name="l00019"></a>00019 <span class="preprocessor">#ifndef __CS_CSUTIL_THREADING_WIN32_CONDITION_H__</span>
<a name="l00020"></a>00020 <span class="preprocessor"></span><span class="preprocessor">#define __CS_CSUTIL_THREADING_WIN32_CONDITION_H__</span>
<a name="l00021"></a>00021 <span class="preprocessor"></span>
<a name="l00022"></a>00022 <span class="preprocessor">#if !defined(CS_PLATFORM_WIN32)</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span><span class="preprocessor">#error "This file is only for Windows and requires you to include csysdefs.h before"</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include "<a class="code" href="atomicops_8h.html" title="Basic low-level atomic operations for different processors.">csutil/threading/atomicops.h</a>"</span>
<a name="l00027"></a>00027 <span class="preprocessor">#include "<a class="code" href="mutex_8h.html" title="Mutual-exclusion object.">csutil/threading/mutex.h</a>"</span>
<a name="l00028"></a>00028 <span class="preprocessor">#include "csutil/threading//win32_apifuncs.h"</span>
<a name="l00029"></a>00029 <span class="preprocessor">#include "csutil/noncopyable.h"</span>
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <span class="keyword">namespace </span>CS
<a name="l00032"></a>00032 {
<a name="l00033"></a>00033 <span class="keyword">namespace </span>Threading
<a name="l00034"></a>00034 {
<a name="l00035"></a>00035 <span class="keyword">namespace </span>Implementation
<a name="l00036"></a>00036 {
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="keyword">static</span> <span class="keywordtype">void</span> __stdcall NotifyFunc (<a class="code" href="namespaceCS_1_1Threading_1_1Implementation.html#9d41520eb29a3738739203db43425fac">Implementation::ulong_ptr</a>)
<a name="l00039"></a>00039 {
<a name="l00040"></a>00040 }
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="keyword">class </span>ConditionBase
<a name="l00043"></a>00043 {
<a name="l00044"></a>00044 <span class="keyword">public</span>:
<a name="l00045"></a>00045 ConditionBase ()
<a name="l00046"></a>00046 {
<a name="l00047"></a>00047 waitingList.next = &waitingList;
<a name="l00048"></a>00048 waitingList.prev = &waitingList;
<a name="l00049"></a>00049 }
<a name="l00050"></a>00050
<a name="l00051"></a>00051 <span class="keywordtype">void</span> NotifyOne ()
<a name="l00052"></a>00052 {
<a name="l00053"></a>00053 StateGateLock lock (stateGate);
<a name="l00054"></a>00054
<a name="l00055"></a>00055 <span class="keywordflow">if</span> (waitingList.prev != &waitingList)
<a name="l00056"></a>00056 {
<a name="l00057"></a>00057 WaitListEntry* <span class="keyword">const</span> entry = waitingList.prev;
<a name="l00058"></a>00058 entry->Unlink ();
<a name="l00059"></a>00059 NotifyEntry (entry);
<a name="l00060"></a>00060 }
<a name="l00061"></a>00061 }
<a name="l00062"></a>00062
<a name="l00063"></a>00063 <span class="keywordtype">void</span> NotifyAll ()
<a name="l00064"></a>00064 {
<a name="l00065"></a>00065 StateGateLock lock (stateGate);
<a name="l00066"></a>00066
<a name="l00067"></a>00067 WaitListEntry* head = waitingList.prev;
<a name="l00068"></a>00068 waitingList.prev = &waitingList;
<a name="l00069"></a>00069 waitingList.next = &waitingList;
<a name="l00070"></a>00070
<a name="l00071"></a>00071 <span class="keywordflow">while</span> (head != &waitingList)
<a name="l00072"></a>00072 {
<a name="l00073"></a>00073 WaitListEntry* <span class="keyword">const</span> prev = head->prev;
<a name="l00074"></a>00074 NotifyEntry (head);
<a name="l00075"></a>00075 head = prev;
<a name="l00076"></a>00076 }
<a name="l00077"></a>00077 }
<a name="l00078"></a>00078
<a name="l00079"></a>00079 <span class="keyword">template</span><<span class="keyword">typename</span> LockType>
<a name="l00080"></a>00080 <span class="keywordtype">bool</span> Wait (LockType& lock, <a class="code" href="group__util.html#g28e82998c4c2d1197a1d412bba7da793" title="A time value measured in milliseconds (1/1000 of a second).">csTicks</a> timeout)
<a name="l00081"></a>00081 {
<a name="l00082"></a>00082 WaitListEntry waitEntry;
<a name="l00083"></a>00083
<a name="l00084"></a>00084 <span class="keywordtype">void</span>* <span class="keyword">const</span> currentProcess = Implementation::GetCurrentProcess ();
<a name="l00085"></a>00085 <span class="keywordtype">void</span>* <span class="keyword">const</span> currentThread = Implementation::GetCurrentThread ();
<a name="l00086"></a>00086
<a name="l00087"></a>00087 Implementation::DuplicateHandle (currentProcess, currentThread, currentProcess,
<a name="l00088"></a>00088 &waitEntry.waitingThreadHandle, 0, <span class="keyword">false</span>, DUPLICATE_SAME_ACCESS);
<a name="l00089"></a>00089
<a name="l00090"></a>00090 {
<a name="l00091"></a>00091 AddEntryHelper<LockType> entryGuard (<span class="keyword">this</span>, waitEntry, lock);
<a name="l00092"></a>00092
<a name="l00093"></a>00093 DWORD r;
<a name="l00094"></a>00094 <span class="comment">// Loop until notified</span>
<a name="l00095"></a>00095 <span class="keywordflow">while</span> (!AtomicOperations::Read (&waitEntry.notified) &&
<a name="l00096"></a>00096 (r = Implementation::SleepEx (timeout == 0 ? INFINITE : timeout,
<a name="l00097"></a>00097 <span class="keyword">true</span>)) == WAIT_IO_COMPLETION)
<a name="l00098"></a>00098 ;
<a name="l00099"></a>00099 <span class="keywordflow">return</span> r != 0;
<a name="l00100"></a>00100 }
<a name="l00101"></a>00101 }
<a name="l00102"></a>00102
<a name="l00103"></a>00103
<a name="l00104"></a>00104 <span class="keyword">protected</span>:
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <span class="comment">// Keep a list of waiting threads</span>
<a name="l00107"></a>00107 <span class="keyword">struct </span>WaitListEntry
<a name="l00108"></a>00108 {
<a name="l00109"></a>00109 <span class="keywordtype">void</span>* waitingThreadHandle;
<a name="l00110"></a>00110 <a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> notified;
<a name="l00111"></a>00111 WaitListEntry* next;
<a name="l00112"></a>00112 WaitListEntry* prev;
<a name="l00113"></a>00113
<a name="l00114"></a>00114 WaitListEntry ()
<a name="l00115"></a>00115 : waitingThreadHandle (0), notified (0), next (0), prev (0)
<a name="l00116"></a>00116 {
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118
<a name="l00119"></a>00119 <span class="keywordtype">void</span> Unlink ()
<a name="l00120"></a>00120 {
<a name="l00121"></a>00121 next->prev = prev;
<a name="l00122"></a>00122 prev->next = next;
<a name="l00123"></a>00123 next = <span class="keyword">this</span>;
<a name="l00124"></a>00124 prev = <span class="keyword">this</span>;
<a name="l00125"></a>00125 }
<a name="l00126"></a>00126 };
<a name="l00127"></a>00127
<a name="l00128"></a>00128 <span class="comment">// Guard our own state</span>
<a name="l00129"></a>00129 <a class="code" href="namespaceCS_1_1Threading.html#a77233dd556d212f73dba0999f0cb596" title="Basic non-recursive mutex.">Mutex</a> stateGate;
<a name="l00130"></a>00130 <span class="keyword">typedef</span> ScopedLock<Mutex> StateGateLock;
<a name="l00131"></a>00131
<a name="l00132"></a>00132 WaitListEntry waitingList;
<a name="l00133"></a>00133
<a name="l00134"></a>00134 <span class="comment">// Helper-class to add/remove entries from waiting list</span>
<a name="l00135"></a>00135 <span class="keyword">template</span><<span class="keyword">typename</span> LockType>
<a name="l00136"></a>00136 <span class="keyword">struct </span>AddEntryHelper
<a name="l00137"></a>00137 {
<a name="l00138"></a>00138 ConditionBase* owner;
<a name="l00139"></a>00139 WaitListEntry& entry;
<a name="l00140"></a>00140 LockType& lock;
<a name="l00141"></a>00141
<a name="l00142"></a>00142 AddEntryHelper (ConditionBase* owner, WaitListEntry& entry, LockType& lock)
<a name="l00143"></a>00143 : owner (owner), entry (entry), lock (lock)
<a name="l00144"></a>00144 {
<a name="l00145"></a>00145 entry.prev = &owner->waitingList;
<a name="l00146"></a>00146 StateGateLock locks (owner->stateGate);
<a name="l00147"></a>00147
<a name="l00148"></a>00148 entry.next = owner->waitingList.next;
<a name="l00149"></a>00149 owner->waitingList.next = &entry;
<a name="l00150"></a>00150 entry.next->prev = &entry;
<a name="l00151"></a>00151
<a name="l00152"></a>00152 lock.Unlock ();
<a name="l00153"></a>00153 }
<a name="l00154"></a>00154
<a name="l00155"></a>00155 ~AddEntryHelper ()
<a name="l00156"></a>00156 {
<a name="l00157"></a>00157 <span class="keywordflow">if</span> (!entry.notified)
<a name="l00158"></a>00158 {
<a name="l00159"></a>00159 StateGateLock locks (owner->stateGate);
<a name="l00160"></a>00160 <span class="keywordflow">if</span> (!entry.notified)
<a name="l00161"></a>00161 {
<a name="l00162"></a>00162 entry.Unlink ();
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165
<a name="l00166"></a>00166 Implementation::CloseHandle ((HANDLE)entry.waitingThreadHandle);
<a name="l00167"></a>00167 lock.Lock ();
<a name="l00168"></a>00168 }
<a name="l00169"></a>00169 };
<a name="l00170"></a>00170 <span class="keyword">template</span><<span class="keyword">typename</span> LockType> <span class="keyword">friend</span> <span class="keyword">struct </span>AddEntryHelper;
<a name="l00171"></a>00171
<a name="l00172"></a>00172 <span class="keywordtype">void</span> NotifyEntry (WaitListEntry* entry)
<a name="l00173"></a>00173 {
<a name="l00174"></a>00174 AtomicOperations::Set (&entry->notified, 1);
<a name="l00175"></a>00175 <span class="keywordflow">if</span> (entry->waitingThreadHandle)
<a name="l00176"></a>00176 {
<a name="l00177"></a>00177 <span class="comment">// Wake up thread</span>
<a name="l00178"></a>00178 Implementation::QueueUserAPC (NotifyFunc, entry->waitingThreadHandle, 0);
<a name="l00179"></a>00179 }
<a name="l00180"></a>00180 }
<a name="l00181"></a>00181 };
<a name="l00182"></a>00182
<a name="l00183"></a>00183 }
<a name="l00184"></a>00184 }
<a name="l00185"></a>00185 }
<a name="l00186"></a>00186
<a name="l00187"></a>00187 <span class="preprocessor">#endif // !defined(CS_PLATFORM_WIN32)</span>
<a name="l00188"></a>00188 <span class="preprocessor"></span>
<a name="l00189"></a>00189 <span class="preprocessor">#endif // __CS_CSUTIL_THREADING_WIN32_CONDITION_H__</span>
</pre></div><hr size="1"><address><small>Generated for Crystal Space 1.2.1 by
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