Initial commit

ringbuffer.c

@@ -0,0 +1,53 @@
+#include <stdint.h>
+#include <pthread.h>
+
+
+#define BUFFER_SIZE 256
+
+uint32_t buffer[BUFFER_SIZE+5];
+
+uint32_t bufferReadIdx = 0;
+uint32_t bufferWriteIdx = 0;
+
+pthread_mutex_t eventMutex = PTHREAD_MUTEX_INITIALIZER;
+pthread_cond_t eventSignal = PTHREAD_COND_INITIALIZER;
+
+
+  
+
+void ringbufferPut(uint32_t f) {
+    if (bufferWriteIdx == (BUFFER_SIZE - 1)) {
+        while (bufferReadIdx == BUFFER_SIZE);
+    } else {
+        while (bufferReadIdx == (bufferWriteIdx + 1));
+    }
+
+    buffer[bufferWriteIdx] = f;
+    bufferWriteIdx++;
+
+    if (bufferWriteIdx > BUFFER_SIZE) {
+        bufferWriteIdx = 0;
+    }
+
+    pthread_mutex_lock(&eventMutex);
+    pthread_cond_signal(&eventSignal);
+    pthread_mutex_unlock(&eventMutex);
+}
+
+
+uint32_t ringbufferGet() {
+    if (bufferReadIdx == bufferWriteIdx) {
+        pthread_mutex_lock(&eventMutex);
+        pthread_cond_wait(&eventSignal, &eventMutex);
+        pthread_mutex_unlock(&eventMutex);
+    }
+
+    double res = buffer[bufferReadIdx];
+    bufferReadIdx++;
+    if (bufferReadIdx > BUFFER_SIZE) {
+        bufferReadIdx = 0;
+    }
+    return res;
+}
+
+