original files of m241

2026-07-30 11:19:44 +05:30
parent 170c2b3f3a
commit afc7070c1f
12254 changed files with 7655111 additions and 0 deletions
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+/* dshmNowRing.h - dSHM Non-OverWritable Rings */
+
+/*
+ * Copyright (c) 2006-2007, 2010 Wind River Systems, Inc.
+ *
+ * The right to copy, distribute, modify or otherwise make use
+ * of this software may be licensed only pursuant to the terms
+ * of an applicable Wind River license agreement.
+ */
+
+/*
+modification history
+--------------------
+01h,15jul10,gjj  deprecated the DSHM technology and added deprecation macros.
+01g,29apr10,pad  Moved extern C statement after include statements.
+01f,27sep07,bwa  fixed WIND104510: DSHM crash on little-endian targets.
+01e,24aug07,bwa  changed DSHM_ATOMIC_SET/CLEAR to DSHM_TAS/CLEAR
+01d,21jun07,bwa  changed RMW to ATOMIC_SET and _CLEAR
+01c,01feb07,bwa  adapted to new spinlock type.
+01b,21dec06,bwa  added volatile qualifiers;
+                 remove non-portable _PACK_ attribute.
+01a,05jul06,bwa  written.
+*/
+
+#ifndef __INCdshmNowRingh
+#define __INCdshmNowRingh
+
+#include <dshm/dshm.h>
+#include <dshm/util/dshmSpinLock.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* this is the ring descriptor in shared memory */
+typedef struct _dshmNowRing
+    {
+    DSHM_SPINLOCK spinlock;	/* atomic access to the ring */
+    uint16_t szEntry;		/* entry size */
+    volatile uint16_t iRead;	/* read index */
+    volatile uint16_t iWrite;	/* write index */
+    uint16_t nEntries;		/* actually ((number of entries in the ring)-1)
+				 * because in the time-critical places this is
+				 * accessed, 1 would always have to be
+				 * substracted from the number of entries.
+				 */
+    } DSHM_NOW_RING;
+
+/*
+This is what the ring data structure looks like with the entries following
+the ring descriptor in shared memory. This data structure is currently not
+used and only kept for reference.
+
+typedef struct _dshmNowRingReal
+    {
+    DSHM_NOW_RING hdr;
+    char entries[1];
+    } DSHM_NOW_RING_REAL;
+*/
+
+#define DSHM_NOW_RING_ENTRY_SIZE(pRing)	\
+    (ntohs(pRing->szEntry))
+#define DSHM_NOW_RING_SIZE(nEntries, szEntry) \
+    (szEntry * nEntries + sizeof(DSHM_NOW_RING))
+
+#define DSHM_NOW_RING_SPINLOCK_RETRIES_DEFAULT	256
+
+void dshmNowRingLibInit (void)
+	_WRS_DEPRECATED ("DSHM will be deprecated, you can use MIPC instead");
+STATUS dshmNowRingInit (DSHM_NOW_RING * const pRing,
+			    uint16_t * const pnEntries,
+			    const uint16_t szEntry)
+	_WRS_DEPRECATED ("DSHM will be deprecated, you can use MIPC instead");
+STATUS dshmNowRingRead (DSHM_NOW_RING * const pRing,
+                            const DSHM_TAS tas,
+                            const DSHM_TAS_CLEAR clear,
+			    char * const pData)
+	_WRS_DEPRECATED ("DSHM will be deprecated, you can use MIPC instead");
+STATUS dshmNowRingWrite (DSHM_NOW_RING * const pRing,
+                            const DSHM_TAS tas,
+                            const DSHM_TAS_CLEAR clear,
+			    const char * const pData)
+	_WRS_DEPRECATED ("DSHM will be deprecated, you can use MIPC instead");
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __INCdshmNowRingh */
+
+