From 3584c739ff527592fb10d5f9dfe7000edbd9fdf3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=A9my=20Zurcher?= <jeremy@asynk.ch>
Date: Sat, 9 Jan 2010 12:29:25 +0100
Subject: add parallel read and write to lf_ring_buffer_test

---
 lf_ring_buffer_test.c | 168 +++++++++++---------------------------------------
 1 file changed, 35 insertions(+), 133 deletions(-)

diff --git a/lf_ring_buffer_test.c b/lf_ring_buffer_test.c
index 8baf232..b131487 100644
--- a/lf_ring_buffer_test.c
+++ b/lf_ring_buffer_test.c
@@ -78,7 +78,14 @@ void* writer_thread( void* param ) {
     return NULL;
 }
 
-static void parallel_writes( int nt, lf_ring_buffer_t *ring, int n, int flags ) {
+void* reader_thread( void* param ) {
+    struct thread_params *params = (struct thread_params*)param;
+    //report( "read ", params->n, sequential_reads( params->ring, params->n, params->flags ) );
+    sequential_reads( params->ring, params->n, params->flags );
+    return NULL;
+}
+
+static void parallel_op( int op, int nt, lf_ring_buffer_t *ring, int n, int flags ) {
     int i;
     
     pthread_t *threads = malloc( sizeof(pthread_t)*nt);
@@ -88,9 +95,26 @@ static void parallel_writes( int nt, lf_ring_buffer_t *ring, int n, int flags )
         params[i].ring = ring;
         params[i].n = n/nt;
         params[i].flags = flags;
-        if (pthread_create( &threads[i], NULL, writer_thread, &params[i])) {
-            fprintf(stderr,"Failed to create reader thread[%d]\n",i);
-            exit(1);
+        if(op==0) {
+            if (pthread_create( &threads[i], NULL, writer_thread, &params[i])) {
+                fprintf(stderr,"Failed to create writer thread[%d]\n",i);
+                exit(1);
+            }
+        } else if(op==1) {
+            if (pthread_create( &threads[i], NULL, reader_thread, &params[i])) {
+                fprintf(stderr,"Failed to create reader thread[%d]\n",i);
+                exit(1);
+            }
+        } else {
+            params[i].n /=2;
+            if (pthread_create( &threads[i], NULL, writer_thread, &params[i])) {
+                fprintf(stderr,"Failed to create writer thread[%d]\n",i);
+                exit(1);
+            }
+            if (pthread_create( &threads[i], NULL, reader_thread, &params[i])) {
+                fprintf(stderr,"Failed to create reader thread[%d]\n",i);
+                exit(1);
+            }
         }
     }
     for(i=0; i<nt; i++) {
@@ -134,146 +158,24 @@ int main( int argc, char** argv ) {
 
     for(i=5; i<=100;i*=2) {
         printf("%d parallel blocking with backoff inc write operations .... \n",i);
-        parallel_writes( i, ring, b_len, 0 );
+        parallel_op( 0, i, ring, b_len, 0 );
         printf("parallel blocking read operations ...\n");
         sequential_reads( ring, b_len, 0 );
     }
     for(i=5; i<=100;i*=2) {
         printf("%d parallel non blocking write operations .... \n",i);
-        parallel_writes( i, ring, b_len, LFRB_NO_BLOCK );
+        parallel_op( 0, i, ring, b_len, LFRB_NO_BLOCK );
         printf("non blocking read operations ...\n");
         sequential_reads( ring, b_len, LFRB_NO_BLOCK );
     }
 
-    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;
+    for(i=10; i<=100;i*=2) {
+        printf("%d parallel blocking write and read operations .... \n",i*2);
+        parallel_op( 3, i, ring, b_len, 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);
-      }
-    }
-  }        
+    lf_ring_buffer_destroy( ring );
 
-  return NULL;    
+    return EXIT_SUCCESS;
 }
 
-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;
-}
-*/
-- 
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