renaming some OPTYap files in order to have a more consistent name organization

2010-04-19 02:34:08 +01:00
parent 73d210c991
commit c221c2ff85
23 changed files with 694 additions and 818 deletions
--- a/OPTYap/locks_x86.h
+++ b/OPTYap/locks_x86.h
@@ -0,0 +1,127 @@
+/************************************************************************
+**                                                                     **
+**                   The YapTab/YapOr/OPTYap systems                   **
+**                                                                     **
+** YapTab extends the Yap Prolog engine to support sequential tabling  **
+** YapOr extends the Yap Prolog engine to support or-parallelism       **
+** OPTYap extends the Yap Prolog engine to support or-parallel tabling **
+**                                                                     **
+**                                                                     **
+**      Yap Prolog was developed at University of Porto, Portugal      **
+**                                                                     **
+************************************************************************/
+
+/************************************************************************
+**                        Atomic locks for X86                         **
+************************************************************************/
+
+typedef struct {
+    volatile unsigned int lock;
+} spinlock_t;
+
+static inline int
+spin_trylock(spinlock_t *lock)
+{
+    char tmp = 1;
+    __asm__ __volatile__(
+			 "xchgb %b0, %1"
+			 : "=q"(tmp), "=m"(lock->lock)
+			 : "0"(tmp) : "memory");
+    return tmp == 0;
+}
+
+static inline void
+spin_unlock(spinlock_t *lock)
+{
+    /* To unlock we move 0 to the lock.
+* On i386 this needs to be a locked operation
+* to avoid Pentium Pro errata 66 and 92.
+*/
+#if defined(__x86_64__)
+    __asm__ __volatile__("" : : : "memory");
+    *(unsigned char*)&lock->lock = 0;
+#else
+    char tmp = 0;
+    __asm__ __volatile__(
+"xchgb %b0, %1"
+: "=q"(tmp), "=m"(lock->lock)
+: "0"(tmp) : "memory");
+#endif
+}
+
+#define TRY_LOCK(LOCK_VAR)  spin_trylock((spinlock_t *)(LOCK_VAR))
+
+#define INIT_LOCK(LOCK_VAR)    ((LOCK_VAR) = 0)
+#define LOCK(LOCK_VAR)         do {	\
+                                 if (TRY_LOCK(&(LOCK_VAR))) break;      \
+		                 while (IS_LOCKED(LOCK_VAR)) continue;  \
+                               } while (1)
+#define IS_LOCKED(LOCK_VAR)    ((LOCK_VAR) != 0)
+#define IS_UNLOCKED(LOCK_VAR)  ((LOCK_VAR) == 0)
+#define UNLOCK(LOCK_VAR)       spin_unlock((spinlock_t *)&(LOCK_VAR))
+
+/* This code has been copied from the sources of the Linux kernel */
+
+/*
+ * On x86, we implement read-write locks as a 32-bit counter
+ * with the high bit (sign) being the "contended" bit.
+ *
+ * The inline assembly is non-obvious. Think about it.
+ *
+ * Changed to use the same technique as rw semaphores.  See
+ * semaphore.h for details.  -ben
+ */
+/* the spinlock helpers are in arch/i386/kernel/semaphore.S */
+
+typedef struct { unsigned long a[100]; } __dummy_lock_t;
+#define __dummy_lock(lock) (*(__dummy_lock_t *)(lock))
+
+typedef struct { volatile unsigned int lock; } rwlock_t;
+
+#define RW_LOCK_BIAS		 0x01000000
+#define RW_LOCK_BIAS_STR	"0x01000000"
+
+#define RW_LOCK_UNLOCKED          RW_LOCK_BIAS
+
+#define __build_read_lock(rw, helper)   \
+	asm volatile("lock\n" \
+                     "subl $1,(%0)\n\t" \
+		     "js 2f\n" \
+		     "1:\n" \
+		     ".section .text.lock,\"ax\"\n" \
+		     "2:\tcall __read_lock_failed\n\t" \
+		     "jmp 1b\n" \
+		     ".previous" \
+		     ::"a" (rw) : "memory")
+
+#define __build_write_lock(rw, helper) \
+	asm volatile("lock\n"\
+                     "subl $" RW_LOCK_BIAS_STR ",(%0)\n\t" \
+		     "jnz 2f\n" \
+		     "1:\n" \
+		     ".section .text.lock,\"ax\"\n" \
+		     "2:\tcall __write_lock_failed\n\t" \
+		     "jmp 1b\n" \
+		     ".previous" \
+		     ::"a" (rw) : "memory")
+
+static inline void read_lock(rwlock_t *rw)
+{
+	__build_read_lock(rw, "__read_lock_failed");
+}
+
+static inline void write_lock(rwlock_t *rw)
+{
+	__build_write_lock(rw, "__write_lock_failed");
+}
+
+
+#define READ_LOCK(X)  read_lock(&(X))
+#define WRITE_LOCK(X)  write_lock(&(X))
+
+#define READ_UNLOCK(rw)		asm volatile("lock ; incl %0" :"=m" (__dummy_lock(&(rw))))
+#define WRITE_UNLOCK(rw)	asm volatile("lock ; addl $" RW_LOCK_BIAS_STR ",%0":"=m" (__dummy_lock(&(rw))))
+
+#define INIT_RWLOCK(RW)   (RW).lock = RW_LOCK_UNLOCKED
+
+