rebase onto develop-2.0

infra/monitor/monitor_spinlock.c

@@ -0,0 +1,72 @@
+// https://www.cs.utexas.edu/~pingali/CS378/2015sp/lectures/Spinlocks%20and%20Read-Write%20Locks.htm
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <pthread.h>
+
+#if 0 /* use gcc builtin function  */
+struct stm_spinlock
+{
+    long value;
+};
+
+struct stm_spinlock *stm_spinlock_new(void)
+{
+    struct stm_spinlock *splock = (struct stm_spinlock *)calloc(1, sizeof(struct stm_spinlock));
+    return splock;
+}
+
+void stm_spinlock_lock(struct stm_spinlock *splock)
+{
+    while (__sync_lock_test_and_set(&splock->value, 1))
+    {
+    }
+}
+
+void stm_spinlock_unlock(struct stm_spinlock *splock)
+{
+    __sync_lock_release(&splock->value);
+}
+
+void stm_spinlock_free(struct stm_spinlock *splock)
+{
+    if (splock)
+    {
+        free(splock);
+    }
+}
+#else /* pthread spin lock */
+struct stm_spinlock
+{
+    pthread_spinlock_t lock_ins;
+};
+
+struct stm_spinlock *stm_spinlock_new(void)
+{
+    struct stm_spinlock *splock = (struct stm_spinlock *)calloc(1, sizeof(struct stm_spinlock));
+    pthread_spin_init(&splock->lock_ins, PTHREAD_PROCESS_PRIVATE);
+    return splock;
+}
+
+void stm_spinlock_lock(struct stm_spinlock *splock)
+{
+    pthread_spin_lock(&splock->lock_ins);
+}
+
+void stm_spinlock_unlock(struct stm_spinlock *splock)
+{
+    pthread_spin_unlock(&splock->lock_ins);
+}
+
+void stm_spinlock_free(struct stm_spinlock *splock)
+{
+    if (splock)
+    {
+        pthread_spin_destroy(&splock->lock_ins);
+        free(splock);
+    }
+}
+#endif