lf_ring_buffer is almost good + tests

1 files changed, 218 insertions, 0 deletions

diff --git a/lf_ring_buffer_test.c b/lf_ring_buffer_test.c
new file mode 100644
index 0000000..31d4810
--- /dev/null
+++ b/lf_ring_buffer_test.c
@@ -0,0 +1,218 @@
+#include <unistd.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#include "lf_ring_buffer.h"
+
+#define BUFFER_LEN 5000000
+
+static rb_data_t[BUFFER_LEN][RB_DATA_LEN]
+
+static const double secs_per_tick = 1.0 / CLOCKS_PER_SEC;
+
+static int64_t time_diff(struct timespec *t0, struct timespec *t1)
+{
+    return ((t1->tv_sec * 1000000000) + t1->tv_nsec) - ((t0->tv_sec * 1000000000) + t0->tv_nsec);
+}
+
+static void print_now(char* s) {
+    fprintf(stdout,s);
+    fflush(stdout);
+}
+
+static void report( int n, uint64_t dt ) {
+    fprintf(stdout,"%d operations in %d [ms] => %d [us] => %d [ns]\t%d [ns/op]\n", n, (int)(dt/1000000), (int)(dt/1000), (int)dt, (int)(dt/n) );
+}
+
+static void feed_data( int n){
+    int i;
+    for(i=0; i<n; i++){
+        sprintf(data[i],"hello world %04d\n",i);
+    }
+}
+
+static uint64_t sequential_writes( lf_ring_buffer_t *ring, int n ) {
+    int i;
+    struct timespec start, end;
+    
+    print_now("sequential writes ... ");
+
+    clock_gettime(CLOCK_MONOTONIC, &start);
+
+    for(i=0; i<n; i++) lf_ring_buffer_write( ring, data[i], 0 );
+
+    clock_gettime(CLOCK_MONOTONIC, &end);
+    printf("done.\n");
+    
+    return time_diff( &start, &end );
+}
+
+static uint64_t sequential_reads( lf_ring_buffer_t *ring, int n ) {
+    int i;
+    char data[20];
+    struct timespec start, end;
+    
+    print_now("sequential reads ... ");
+
+    clock_gettime(CLOCK_MONOTONIC, &start);
+
+    for(i=0; i<n; i++) lf_ring_buffer_read( ring, data, 0 );
+
+    clock_gettime(CLOCK_MONOTONIC, &end);
+    printf("done.\n");
+    
+    return time_diff( &start, &end );
+}
+
+int main( int argc, char** argv ) {
+    
+    int b_len = BUFFER_LEN;
+    lf_ring_buffer_t *ring;
+
+    ring = lf_ring_buffer_create( b_len );
+    if(ring==NULL){
+        fprintf(stderr,"ERROR : lf_ring_buffer_create( %d );\n",b_len);
+        exit( EXIT_FAILURE );
+    }
+
+    print_now("feed the data ... ");
+    feed_data(b_len);
+    printf("done.\n");
+
+    report( b_len, sequential_writes( ring, b_len ) );
+    report( sequential_reads( ring, b_len ) );
+
+    lf_ring_buffer_destroy( ring );
+
+    return EXIT_SUCCESS;
+}
+
+/*
+#define ARRAY_SIZE 2
+#define MAX_VALUE 0x10000
+
+jack_ringbuffer_t *rb;
+volatile int flowing = 0;
+
+static int
+fill_int_array (int *array, int start, int count)
+{
+  int i, j = start;
+  for (i = 0; i < count; i++)
+  {
+    array[i] = j;
+    j = (j + 1) % MAX_VALUE;
+  }
+  return j;
+}
+
+static int
+cmp_array (int *array1, int *array2, int count)
+{
+  int i;
+  for (i = 0; i < count; i++)
+    if (array1[i] != array2[i])
+    {
+      printf("%d != %d at offset %d\n", array1[i], array2[i], i);
+      fflush(stdout);
+      return 0;
+    }
+
+  return 1;      
+}
+
+static void *
+reader_start (void * arg)
+{
+  int i = 0, a[ARRAY_SIZE], b[ARRAY_SIZE];
+  unsigned long j = 0, nfailures = 0;
+  printf("[reader started] ");
+  fflush(stdout);
+  i = fill_int_array (a, i, ARRAY_SIZE);
+  while (1)
+  {
+    if (j == 100 && !flowing)
+    {
+      printf("[flowing] ");
+      fflush(stdout);
+      flowing = 1;
+    }
+
+    if (jack_ringbuffer_read_space (rb) >= (int) ARRAY_SIZE * (int) sizeof (int))
+    {
+      if (jack_ringbuffer_read (rb, (char *) b, ARRAY_SIZE * sizeof (int)))
+      {
+        if (!cmp_array (a, b, ARRAY_SIZE))
+        {
+          nfailures++;
+          //
+          //printf("failure in chunk %lu - probability: %lu/%lu = %.3f per million\n", 
+          //       j, nfailures, j, (float) nfailures / (j + 1) * 1000000);
+          //i = (b[0] + ARRAY_SIZE) % MAX_VALUE;
+          //
+          printf("FAILURE in chunk %lu\n", j);
+          fflush(stdout);
+          exit(1);
+        }
+        i = fill_int_array (a, i, ARRAY_SIZE);
+        j++;
+      }
+    }
+  }
+
+  return NULL;    
+}
+
+static void *
+writer_start (void * arg)
+{
+  int i = 0, a[ARRAY_SIZE];
+  printf("[writer started] ");
+  fflush(stdout);
+
+  i = fill_int_array (a, i, ARRAY_SIZE);
+
+  while (1)
+  {
+    if (jack_ringbuffer_write_space (rb) >= (int) ARRAY_SIZE * (int) sizeof (int))
+    {
+      if (jack_ringbuffer_write (rb, (char *) a, ARRAY_SIZE * sizeof (int)))
+      {
+        i = fill_int_array (a, i, ARRAY_SIZE);
+      }
+    }
+  }        
+
+  return NULL;    
+}
+
+int main(int argc, char *argv[])
+{
+  int size;
+  sscanf(argv[1], "%d", &size);
+  printf("starting (120s max) - array/buffer size: %d/%d\n", 
+         (int) sizeof(int) * ARRAY_SIZE, size);
+  fflush(stdout);
+  rb = jack_ringbuffer_create(size);
+  pthread_t reader_thread, writer_thread;
+  if (pthread_create (&reader_thread, NULL, reader_start, NULL))
+  {
+    printf("Failed to create reader thread\n");
+    exit(1);
+  }
+  if (pthread_create (&writer_thread, NULL, writer_start, NULL))
+  {
+    printf("Failed to create writer thread\n");
+    exit(1);
+  }
+  sleep(120);
+  if (flowing)
+    printf("SUCCESS\n");
+  else
+    printf("FAILURE: data did not flow\n");
+  fflush(stdout);
+  return 0;
+}
+*/