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<h1>include/nucleus/synch.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"> * @note Copyright (C) 2001,2002,2003 Philippe Gerum <rpm@xenomai.org>.</span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * Xenomai is free software; you can redistribute it and/or modify</span>
<a name="l00005"></a>00005 <span class="comment"> * it under the terms of the GNU General Public License as published</span>
<a name="l00006"></a>00006 <span class="comment"> * by the Free Software Foundation; either version 2 of the License,</span>
<a name="l00007"></a>00007 <span class="comment"> * 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"> * Xenomai is distributed in the hope that it will be useful, but</span>
<a name="l00010"></a>00010 <span class="comment"> * 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"> * 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 General Public License</span>
<a name="l00015"></a>00015 <span class="comment"> * along with Xenomai; if not, write to the Free Software</span>
<a name="l00016"></a>00016 <span class="comment"> * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA</span>
<a name="l00017"></a>00017 <span class="comment"> * 02111-1307, USA.</span>
<a name="l00018"></a>00018 <span class="comment"> *</span>
<a name="l00019"></a>00019 <span class="comment"> * \ingroup synch</span>
<a name="l00020"></a>00020 <span class="comment"> */</span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="preprocessor">#ifndef _XENO_NUCLEUS_SYNCH_H</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span><span class="preprocessor">#define _XENO_NUCLEUS_SYNCH_H</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span>
<a name="l00025"></a>00025 <span class="preprocessor">#include <nucleus/queue.h></span>
<a name="l00026"></a>00026
<a name="l00027"></a>00027 <span class="comment">/* Creation flags */</span>
<a name="l00028"></a>00028 <span class="preprocessor">#define XNSYNCH_FIFO 0x0</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span><span class="preprocessor">#define XNSYNCH_PRIO 0x1</span>
<a name="l00030"></a>00030 <span class="preprocessor"></span><span class="preprocessor">#define XNSYNCH_NOPIP 0x0</span>
<a name="l00031"></a>00031 <span class="preprocessor"></span><span class="preprocessor">#define XNSYNCH_PIP 0x2</span>
<a name="l00032"></a>00032 <span class="preprocessor"></span><span class="preprocessor">#define XNSYNCH_DREORD 0x4</span>
<a name="l00033"></a>00033 <span class="preprocessor"></span><span class="preprocessor">#define XNSYNCH_OWNER 0x8</span>
<a name="l00034"></a>00034 <span class="preprocessor"></span>
<a name="l00035"></a>00035 <span class="preprocessor">#ifndef CONFIG_XENO_OPT_DEBUG_SYNCH_RELAX</span>
<a name="l00036"></a>00036 <span class="preprocessor"></span><span class="preprocessor">#define CONFIG_XENO_OPT_DEBUG_SYNCH_RELAX 0</span>
<a name="l00037"></a>00037 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* CONFIG_XENO_OPT_DEBUG_SYNCH_RELAX */</span>
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="preprocessor">#ifdef CONFIG_XENO_FASTSYNCH</span>
<a name="l00040"></a>00040 <span class="preprocessor"></span>
<a name="l00041"></a>00041 <span class="comment">/* Fast lock API */</span>
<a name="l00042"></a>00042 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> xnsynch_fast_owner_check(xnarch_atomic_t *fastlock,
<a name="l00043"></a>00043 xnhandle_t ownerh)
<a name="l00044"></a>00044 {
<a name="l00045"></a>00045 <span class="keywordflow">return</span> (xnhandle_mask_spare(xnarch_atomic_get(fastlock)) == ownerh) ?
<a name="l00046"></a>00046 0 : -EPERM;
<a name="l00047"></a>00047 }
<a name="l00048"></a>00048
<a name="l00049"></a>00049 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> xnsynch_fast_acquire(xnarch_atomic_t *fastlock,
<a name="l00050"></a>00050 xnhandle_t new_ownerh)
<a name="l00051"></a>00051 {
<a name="l00052"></a>00052 xnhandle_t lock_state =
<a name="l00053"></a>00053 xnarch_atomic_cmpxchg(fastlock, XN_NO_HANDLE, new_ownerh);
<a name="l00054"></a>00054
<a name="l00055"></a>00055 <span class="keywordflow">if</span> (likely(lock_state == XN_NO_HANDLE))
<a name="l00056"></a>00056 <span class="keywordflow">return</span> 0;
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="keywordflow">if</span> (xnhandle_mask_spare(lock_state) == new_ownerh)
<a name="l00059"></a>00059 <span class="keywordflow">return</span> -EBUSY;
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="keywordflow">return</span> -EAGAIN;
<a name="l00062"></a>00062 }
<a name="l00063"></a>00063
<a name="l00064"></a>00064 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> xnsynch_fast_release(xnarch_atomic_t *fastlock,
<a name="l00065"></a>00065 xnhandle_t cur_ownerh)
<a name="l00066"></a>00066 {
<a name="l00067"></a>00067 <span class="keywordflow">return</span> (xnarch_atomic_cmpxchg(fastlock, cur_ownerh, XN_NO_HANDLE) ==
<a name="l00068"></a>00068 cur_ownerh);
<a name="l00069"></a>00069 }
<a name="l00070"></a>00070
<a name="l00071"></a>00071 <span class="preprocessor">#else </span><span class="comment">/* !CONFIG_XENO_FASTSYNCH */</span>
<a name="l00072"></a>00072
<a name="l00073"></a>00073 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> xnsynch_fast_acquire(xnarch_atomic_t *fastlock,
<a name="l00074"></a>00074 xnhandle_t new_ownerh)
<a name="l00075"></a>00075 {
<a name="l00076"></a>00076 <span class="keywordflow">return</span> -ENOSYS;
<a name="l00077"></a>00077 }
<a name="l00078"></a>00078
<a name="l00079"></a>00079 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> xnsynch_fast_release(xnarch_atomic_t *fastlock,
<a name="l00080"></a>00080 xnhandle_t cur_ownerh)
<a name="l00081"></a>00081 {
<a name="l00082"></a>00082 <span class="keywordflow">return</span> -1;
<a name="l00083"></a>00083 }
<a name="l00084"></a>00084
<a name="l00085"></a>00085 <span class="preprocessor">#endif </span><span class="comment">/* !CONFIG_XENO_FASTSYNCH */</span>
<a name="l00086"></a>00086
<a name="l00087"></a>00087 <span class="preprocessor">#if defined(__KERNEL__) || defined(__XENO_SIM__)</span>
<a name="l00088"></a>00088 <span class="preprocessor"></span>
<a name="l00089"></a>00089 <span class="preprocessor">#define XNSYNCH_CLAIMED 0x10 </span><span class="comment">/* Claimed by other thread(s) w/ PIP */</span>
<a name="l00090"></a>00090
<a name="l00091"></a>00091 <span class="preprocessor">#define XNSYNCH_FLCLAIM XN_HANDLE_SPARE3 </span><span class="comment">/* Corresponding bit in fast lock */</span>
<a name="l00092"></a>00092
<a name="l00093"></a>00093 <span class="comment">/* Spare flags usable by upper interfaces */</span>
<a name="l00094"></a>00094 <span class="preprocessor">#define XNSYNCH_SPARE0 0x01000000</span>
<a name="l00095"></a>00095 <span class="preprocessor"></span><span class="preprocessor">#define XNSYNCH_SPARE1 0x02000000</span>
<a name="l00096"></a>00096 <span class="preprocessor"></span><span class="preprocessor">#define XNSYNCH_SPARE2 0x04000000</span>
<a name="l00097"></a>00097 <span class="preprocessor"></span><span class="preprocessor">#define XNSYNCH_SPARE3 0x08000000</span>
<a name="l00098"></a>00098 <span class="preprocessor"></span><span class="preprocessor">#define XNSYNCH_SPARE4 0x10000000</span>
<a name="l00099"></a>00099 <span class="preprocessor"></span><span class="preprocessor">#define XNSYNCH_SPARE5 0x20000000</span>
<a name="l00100"></a>00100 <span class="preprocessor"></span><span class="preprocessor">#define XNSYNCH_SPARE6 0x40000000</span>
<a name="l00101"></a>00101 <span class="preprocessor"></span><span class="preprocessor">#define XNSYNCH_SPARE7 0x80000000</span>
<a name="l00102"></a>00102 <span class="preprocessor"></span>
<a name="l00103"></a>00103 <span class="comment">/* Statuses */</span>
<a name="l00104"></a>00104 <span class="preprocessor">#define XNSYNCH_DONE 0 </span><span class="comment">/* Resource available / operation complete */</span>
<a name="l00105"></a>00105 <span class="preprocessor">#define XNSYNCH_WAIT 1 </span><span class="comment">/* Calling thread blocked -- start rescheduling */</span>
<a name="l00106"></a>00106 <span class="preprocessor">#define XNSYNCH_RESCHED 2 </span><span class="comment">/* Force rescheduling */</span>
<a name="l00107"></a>00107
<a name="l00108"></a>00108 <span class="keyword">struct </span>xnthread;
<a name="l00109"></a>00109 <span class="keyword">struct </span>xnsynch;
<a name="l00110"></a>00110 <span class="keyword">struct </span>xnmutex;
<a name="l00111"></a>00111
<a name="l00112"></a>00112 <span class="keyword">typedef</span> <span class="keyword">struct </span>xnsynch {
<a name="l00113"></a>00113
<a name="l00114"></a>00114 xnpholder_t link; <span class="comment">/* Link in claim queues */</span>
<a name="l00115"></a>00115
<a name="l00116"></a>00116 <span class="preprocessor">#define link2synch(ln) container_of(ln, struct xnsynch, link)</span>
<a name="l00117"></a>00117 <span class="preprocessor"></span>
<a name="l00118"></a>00118 xnflags_t status; <span class="comment">/* Status word */</span>
<a name="l00119"></a>00119
<a name="l00120"></a>00120 xnpqueue_t pendq; <span class="comment">/* Pending threads */</span>
<a name="l00121"></a>00121
<a name="l00122"></a>00122 <span class="keyword">struct </span>xnthread *owner; <span class="comment">/* Thread which owns the resource */</span>
<a name="l00123"></a>00123
<a name="l00124"></a>00124 <span class="preprocessor">#ifdef CONFIG_XENO_FASTSYNCH</span>
<a name="l00125"></a>00125 <span class="preprocessor"></span> xnarch_atomic_t *fastlock; <span class="comment">/* Pointer to fast lock word */</span>
<a name="l00126"></a>00126 <span class="preprocessor">#endif </span><span class="comment">/* CONFIG_XENO_FASTSYNCH */</span>
<a name="l00127"></a>00127
<a name="l00128"></a>00128 void (*cleanup)(<span class="keyword">struct </span>xnsynch *synch); <span class="comment">/* Cleanup handler */</span>
<a name="l00129"></a>00129
<a name="l00130"></a>00130 XNARCH_DECL_DISPLAY_CONTEXT();
<a name="l00131"></a>00131
<a name="l00132"></a>00132 } xnsynch_t;
<a name="l00133"></a>00133
<a name="l00134"></a>00134 <span class="preprocessor">#define xnsynch_test_flags(synch,flags) testbits((synch)->status,flags)</span>
<a name="l00135"></a>00135 <span class="preprocessor"></span><span class="preprocessor">#define xnsynch_set_flags(synch,flags) setbits((synch)->status,flags)</span>
<a name="l00136"></a>00136 <span class="preprocessor"></span><span class="preprocessor">#define xnsynch_clear_flags(synch,flags) clrbits((synch)->status,flags)</span>
<a name="l00137"></a>00137 <span class="preprocessor"></span><span class="preprocessor">#define xnsynch_wait_queue(synch) (&((synch)->pendq))</span>
<a name="l00138"></a>00138 <span class="preprocessor"></span><span class="preprocessor">#define xnsynch_nsleepers(synch) countpq(&((synch)->pendq))</span>
<a name="l00139"></a>00139 <span class="preprocessor"></span><span class="preprocessor">#define xnsynch_pended_p(synch) (!emptypq_p(&((synch)->pendq)))</span>
<a name="l00140"></a>00140 <span class="preprocessor"></span><span class="preprocessor">#define xnsynch_owner(synch) ((synch)->owner)</span>
<a name="l00141"></a>00141 <span class="preprocessor"></span>
<a name="l00142"></a>00142 <span class="preprocessor">#ifdef CONFIG_XENO_FASTSYNCH</span>
<a name="l00143"></a>00143 <span class="preprocessor"></span><span class="preprocessor">#define xnsynch_fastlock(synch) ((synch)->fastlock)</span>
<a name="l00144"></a>00144 <span class="preprocessor"></span><span class="preprocessor">#define xnsynch_fastlock_p(synch) ((synch)->fastlock != NULL)</span>
<a name="l00145"></a>00145 <span class="preprocessor"></span><span class="preprocessor">#define xnsynch_owner_check(synch, thread) \</span>
<a name="l00146"></a>00146 <span class="preprocessor"> xnsynch_fast_owner_check((synch)->fastlock, xnthread_handle(thread))</span>
<a name="l00147"></a>00147 <span class="preprocessor"></span><span class="preprocessor">#else </span><span class="comment">/* !CONFIG_XENO_FASTSYNCH */</span>
<a name="l00148"></a>00148 <span class="preprocessor">#define xnsynch_fastlock(synch) ((xnarch_atomic_t *)NULL)</span>
<a name="l00149"></a>00149 <span class="preprocessor"></span><span class="preprocessor">#define xnsynch_fastlock_p(synch) 0</span>
<a name="l00150"></a>00150 <span class="preprocessor"></span><span class="preprocessor">#define xnsynch_owner_check(synch, thread) \</span>
<a name="l00151"></a>00151 <span class="preprocessor"> ((synch)->owner == thread ? 0 : -EPERM)</span>
<a name="l00152"></a>00152 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* !CONFIG_XENO_FASTSYNCH */</span>
<a name="l00153"></a>00153
<a name="l00154"></a>00154 <span class="preprocessor">#define xnsynch_fast_is_claimed(fastlock) \</span>
<a name="l00155"></a>00155 <span class="preprocessor"> xnhandle_test_spare(fastlock, XNSYNCH_FLCLAIM)</span>
<a name="l00156"></a>00156 <span class="preprocessor"></span><span class="preprocessor">#define xnsynch_fast_set_claimed(fastlock, enable) \</span>
<a name="l00157"></a>00157 <span class="preprocessor"> (((fastlock) & ~XNSYNCH_FLCLAIM) | ((enable) ? XNSYNCH_FLCLAIM : 0))</span>
<a name="l00158"></a>00158 <span class="preprocessor"></span><span class="preprocessor">#define xnsynch_fast_mask_claimed(fastlock) ((fastlock) & ~XNSYNCH_FLCLAIM)</span>
<a name="l00159"></a>00159 <span class="preprocessor"></span>
<a name="l00160"></a>00160 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00161"></a>00161 <span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">"C"</span> {
<a name="l00162"></a>00162 <span class="preprocessor">#endif</span>
<a name="l00163"></a>00163 <span class="preprocessor"></span>
<a name="l00164"></a>00164 <span class="preprocessor">#if XENO_DEBUG(SYNCH_RELAX)</span>
<a name="l00165"></a>00165 <span class="preprocessor"></span>
<a name="l00166"></a>00166 <span class="keywordtype">void</span> xnsynch_detect_relaxed_owner(<span class="keyword">struct</span> xnsynch *synch,
<a name="l00167"></a>00167 <span class="keyword">struct</span> xnthread *sleeper);
<a name="l00168"></a>00168
<a name="l00169"></a>00169 <span class="keywordtype">void</span> xnsynch_detect_claimed_relax(<span class="keyword">struct</span> xnthread *owner);
<a name="l00170"></a>00170
<a name="l00171"></a>00171 <span class="preprocessor">#else </span><span class="comment">/* !XENO_DEBUG(SYNCH_RELAX) */</span>
<a name="l00172"></a>00172
<a name="l00173"></a>00173 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> xnsynch_detect_relaxed_owner(<span class="keyword">struct</span> xnsynch *synch,
<a name="l00174"></a>00174 <span class="keyword">struct</span> xnthread *sleeper)
<a name="l00175"></a>00175 {
<a name="l00176"></a>00176 }
<a name="l00177"></a>00177
<a name="l00178"></a>00178 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> xnsynch_detect_claimed_relax(<span class="keyword">struct</span> xnthread *owner)
<a name="l00179"></a>00179 {
<a name="l00180"></a>00180 }
<a name="l00181"></a>00181
<a name="l00182"></a>00182 <span class="preprocessor">#endif </span><span class="comment">/* !XENO_DEBUG(SYNCH_RELAX) */</span>
<a name="l00183"></a>00183
<a name="l00184"></a>00184 <span class="keywordtype">void</span> <a class="code" href="group__synch.html#g4c07b8ec87b14cf18ef512f0e0aade51" title="Initialize a synchronization object.">xnsynch_init</a>(<span class="keyword">struct</span> xnsynch *synch, xnflags_t flags,
<a name="l00185"></a>00185 xnarch_atomic_t *fastlock);
<a name="l00186"></a>00186
<a name="l00187"></a>00187 <span class="preprocessor">#define xnsynch_destroy(synch) xnsynch_flush(synch, XNRMID)</span>
<a name="l00188"></a>00188 <span class="preprocessor"></span>
<a name="l00189"></a>00189 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> xnsynch_set_owner(<span class="keyword">struct</span> xnsynch *synch,
<a name="l00190"></a>00190 <span class="keyword">struct</span> xnthread *thread)
<a name="l00191"></a>00191 {
<a name="l00192"></a>00192 synch->owner = thread;
<a name="l00193"></a>00193 }
<a name="l00194"></a>00194
<a name="l00195"></a>00195 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> xnsynch_register_cleanup(<span class="keyword">struct</span> xnsynch *synch,
<a name="l00196"></a>00196 <span class="keywordtype">void</span> (*handler)(<span class="keyword">struct</span> xnsynch *))
<a name="l00197"></a>00197 {
<a name="l00198"></a>00198 synch->cleanup = handler;
<a name="l00199"></a>00199 }
<a name="l00200"></a>00200
<a name="l00201"></a>00201 xnflags_t <a class="code" href="group__synch.html#g2747e9834546af461f118e7c90c9613e" title="Sleep on an ownerless synchronization object.">xnsynch_sleep_on</a>(<span class="keyword">struct</span> xnsynch *synch,
<a name="l00202"></a>00202 xnticks_t timeout,
<a name="l00203"></a>00203 xntmode_t timeout_mode);
<a name="l00204"></a>00204
<a name="l00205"></a>00205 <span class="keyword">struct </span>xnthread *<a class="code" href="group__synch.html#gd5992ddbdb81821cb29bae8900eb65ac" title="Give the resource ownership to the next waiting thread.">xnsynch_wakeup_one_sleeper</a>(<span class="keyword">struct</span> xnsynch *synch);
<a name="l00206"></a>00206
<a name="l00207"></a>00207 xnpholder_t *<a class="code" href="group__synch.html#g9e530d12df9881251231af489208762e" title="Give the resource ownership to a given waiting thread.">xnsynch_wakeup_this_sleeper</a>(<span class="keyword">struct</span> xnsynch *synch,
<a name="l00208"></a>00208 xnpholder_t *holder);
<a name="l00209"></a>00209
<a name="l00210"></a>00210 xnflags_t <a class="code" href="group__synch.html#g6d4ad886901c751a4f3c51b90fc8f91f" title="Acquire the ownership of a synchronization object.">xnsynch_acquire</a>(<span class="keyword">struct</span> xnsynch *synch,
<a name="l00211"></a>00211 xnticks_t timeout,
<a name="l00212"></a>00212 xntmode_t timeout_mode);
<a name="l00213"></a>00213
<a name="l00214"></a>00214 <span class="keyword">struct </span>xnthread *<a class="code" href="group__synch.html#g1208abb6b3d0017a4e0c43b9baff8cfb" title="Give the resource ownership to the next waiting thread.">xnsynch_release</a>(<span class="keyword">struct</span> xnsynch *synch);
<a name="l00215"></a>00215
<a name="l00216"></a>00216 <span class="keyword">struct </span>xnthread *<a class="code" href="group__synch.html#ge02c775ea161a0c27b919d019d170bc2" title="Access the thread leading a synch object wait queue.">xnsynch_peek_pendq</a>(<span class="keyword">struct</span> xnsynch *synch);
<a name="l00217"></a>00217
<a name="l00218"></a>00218 <span class="keywordtype">int</span> <a class="code" href="group__synch.html#g82beb68147bc5f0306ab02a61a9dc76b" title="Unblock all waiters pending on a resource.">xnsynch_flush</a>(<span class="keyword">struct</span> xnsynch *synch, xnflags_t reason);
<a name="l00219"></a>00219
<a name="l00220"></a>00220 <span class="keywordtype">void</span> <a class="code" href="group__synch.html#g51146a2d5bd0ec6a10d2fcd685946938" title="Release all ownerships.">xnsynch_release_all_ownerships</a>(<span class="keyword">struct</span> xnthread *thread);
<a name="l00221"></a>00221
<a name="l00222"></a>00222 <span class="keywordtype">void</span> <a class="code" href="group__synch.html#g49c975f160509b1aa04df4900614b2ce" title="Change a sleeper&#39;s priority.">xnsynch_requeue_sleeper</a>(<span class="keyword">struct</span> xnthread *thread);
<a name="l00223"></a>00223
<a name="l00224"></a>00224 <span class="keywordtype">void</span> <a class="code" href="group__synch.html#g997e546948920193bb36ab8d120fbab7" title="Abort a wait for a resource.">xnsynch_forget_sleeper</a>(<span class="keyword">struct</span> xnthread *thread);
<a name="l00225"></a>00225
<a name="l00226"></a>00226 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00227"></a>00227 <span class="preprocessor"></span>}
<a name="l00228"></a>00228 <span class="preprocessor">#endif</span>
<a name="l00229"></a>00229 <span class="preprocessor"></span>
<a name="l00230"></a>00230 <span class="preprocessor">#endif </span><span class="comment">/* __KERNEL__ || __XENO_SIM__ */</span>
<a name="l00231"></a>00231
<a name="l00232"></a>00232 <span class="preprocessor">#endif </span><span class="comment">/* !_XENO_NUCLEUS_SYNCH_H_ */</span>
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