--- /dev/null
+/* -------------------------------------------------------------- */
+/* (C)Copyright 2001,2007, */
+/* International Business Machines Corporation, */
+/* Sony Computer Entertainment, Incorporated, */
+/* Toshiba Corporation, */
+/* */
+/* All Rights Reserved. */
+/* */
+/* Redistribution and use in source and binary forms, with or */
+/* without modification, are permitted provided that the */
+/* following conditions are met: */
+/* */
+/* - Redistributions of source code must retain the above copyright*/
+/* notice, this list of conditions and the following disclaimer. */
+/* */
+/* - Redistributions in binary form must reproduce the above */
+/* copyright notice, this list of conditions and the following */
+/* disclaimer in the documentation and/or other materials */
+/* provided with the distribution. */
+/* */
+/* - Neither the name of IBM Corporation nor the names of its */
+/* contributors may be used to endorse or promote products */
+/* derived from this software without specific prior written */
+/* permission. */
+/* */
+/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */
+/* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, */
+/* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
+/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
+/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR */
+/* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
+/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT */
+/* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */
+/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) */
+/* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */
+/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR */
+/* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */
+/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
+/* -------------------------------------------------------------- */
+/* PROLOG END TAG zYx */
+#ifndef _SPU_COND_INIT_H_
+#define _SPU_COND_INIT_H_
+
+#include "sync_utils.h"
+#include "cond.h"
+#include <spu_mfcio.h>
+
+
+/**
+ * cond_init - initialize condition variable.
+ * @cond: handle to effective address of condition variable.
+ *
+ *
+ * Conditional Variable - is a synchronization device that allows
+ * SPE and PPE threads to suspend execution and relinquish the
+ * processors until some predicate on shared data is satisfied.
+ * The basic operations on conditions are: signal the condition
+ * (when the predicate becomes true), and wait for the condition,
+ * suspending the thread execution until anoter thread signals the
+ * condition
+ *
+ * A condition variable must always be associated with a mutex, to
+ * avoid the race condition where a thread prepares to wait on a
+ * condition variable and another thread signals the condition just
+ * before the first thread actually waits on it.
+ *
+ * cond_init initializes the condition variable cond.
+ *
+ * cond_signal restarts one of the threads that are waiting on the
+ * condition variable cond. If no threads are waiting on cond, nothing
+ * happens. If several threads are waiting on cond, exactly one
+ * is restarted, but it is not specified which
+ *
+ * cond_broadcast restarts all the threads that are waiting on the
+ * condition variable cond. Nothing happens if no threads are waiting
+ * on cond
+ *
+ * cond_wait atomically unlocks the mutex and waits for the condition
+ * variable cond to be signaled. The mutex must be lock locked by
+ * the calling thread on the entrance to cond_wait. Before returning
+ * to the calling thread, cond_wait re-acquires mutex.
+ *
+ * Only one thread initializes a condition variable. Usually, the
+ * PPE thread initializes a condidtion variable, however, a cond_init
+ * function is provided here for completeness
+ *
+ * Description: Initialize a cond variable to false.
+ */
+static __inline void _cond_init(cond_ea_t cond )
+{
+ char _tmp[256];
+ char *tmp = (char *) ALIGN(_tmp, 128);
+ volatile unsigned short *buf = (volatile unsigned short *) &tmp[0];
+ unsigned int size = 128, tagid;
+ unsigned int offset;
+ addr64 ea64;
+ unsigned int oldtmask;
+ unsigned int tagmask;
+
+ tagid = mfc_tag_reserve();
+
+ tagmask = 1 << (tagid & 31);
+
+ ea64.ull = ALIGN128_EA(cond);
+ offset = OFFSET128_EA_U16(cond);
+
+ MFC_DMA(buf, ea64, size, tagid & 31, MFC_GET_CMD);
+ oldtmask = spu_readch(MFC_RdTagMask);
+ spu_writech(MFC_WrTagMask, tagmask);
+ spu_writech(MFC_WrTagUpdate, MFC_TAG_UPDATE_ANY);
+ spu_readch(MFC_RdTagStat);
+
+ /* this is still just one word. since buf is of type
+ * short, we fit both counts into one word. */
+ buf[offset] = 0;
+ buf[offset+1] = 0;
+ MFC_DMA(buf, ea64, size, (tagid & 31), MFC_PUT_CMD);
+ spu_writech(MFC_WrTagMask, tagmask);
+ spu_writech(MFC_WrTagUpdate, MFC_TAG_UPDATE_ANY);
+ spu_readch(MFC_RdTagStat);
+ spu_writech(MFC_WrTagMask, oldtmask);
+ mfc_tag_release (tagid);
+}
+
+
+
+#endif /* _SPU_COND_INIT_H_ */
projects / debian / gnuradio / blobdiff