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* Examples/ex13.c: Make local functions static.

Browse Source 
* ecmutex.c: Likewise. 
* Examples/ex14.c: Likewise.
	* Examples/ex2.c: Make local functions static; reformat.
	* Examples/ex1.c: Likewise.
	* Examples/ex4.c: Likewise.
	* Examples/ex5.c: Likewise.
	* Examples/ex7.c: Likewise.

CVS ----------------------------------------------------------------------
This commit is contained in:
Andreas Jaeger
2000-12-27 17:14:56 +00:00
parent 2111285729
commit a375a533a2
8 changed files with 199 additions and 156 deletions
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82
linuxthreads/Examples/ex5.c
View File

@@ -10,50 +10,56 @@
/* Circular buffer of integers. */
struct prodcons {
int buffer[BUFFER_SIZE]; /* the actual data */
int readpos, writepos; /* positions for reading and writing */
sem_t sem_read; /* number of elements available for reading */
sem_t sem_write; /* number of locations available for writing */
struct prodcons
{
int buffer[BUFFER_SIZE]; /* the actual data */
int readpos, writepos; /* positions for reading and writing */
sem_t sem_read; /* number of elements available for reading */
sem_t sem_write; /* number of locations available for writing */
};
/* Initialize a buffer */
void init(struct prodcons * b)
static void
init (struct prodcons *b)
{
sem_init(&b->sem_write, 0, BUFFER_SIZE - 1);
sem_init(&b->sem_read, 0, 0);
sem_init (&b->sem_write, 0, BUFFER_SIZE - 1);
sem_init (&b->sem_read, 0, 0);
b->readpos = 0;
b->writepos = 0;
}
/* Store an integer in the buffer */
void put(struct prodcons * b, int data)
static void
put (struct prodcons *b, int data)
{
/* Wait until buffer is not full */
sem_wait(&b->sem_write);
sem_wait (&b->sem_write);
/* Write the data and advance write pointer */
b->buffer[b->writepos] = data;
b->writepos++;
if (b->writepos >= BUFFER_SIZE) b->writepos = 0;
if (b->writepos >= BUFFER_SIZE)
b->writepos = 0;
/* Signal that the buffer contains one more element for reading */
sem_post(&b->sem_read);
sem_post (&b->sem_read);
}
/* Read and remove an integer from the buffer */
int get(struct prodcons * b)
static int
get (struct prodcons *b)
{
int data;
/* Wait until buffer is not empty */
sem_wait(&b->sem_read);
sem_wait (&b->sem_read);
/* Read the data and advance read pointer */
data = b->buffer[b->readpos];
b->readpos++;
if (b->readpos >= BUFFER_SIZE) b->readpos = 0;
if (b->readpos >= BUFFER_SIZE)
b->readpos = 0;
/* Signal that the buffer has now one more location for writing */
sem_post(&b->sem_write);
sem_post (&b->sem_write);
return data;
}
@@ -64,39 +70,45 @@ int get(struct prodcons * b)
struct prodcons buffer;
void * producer(void * data)
static void *
producer (void *data)
{
int n;
for (n = 0; n < 10000; n++) {
printf("%d --->\n", n);
put(&buffer, n);
}
put(&buffer, OVER);
for (n = 0; n < 10000; n++)
{
printf ("%d --->\n", n);
put (&buffer, n);
}
put (&buffer, OVER);
return NULL;
}
void * consumer(void * data)
static void *
consumer (void *data)
{
int d;
while (1) {
d = get(&buffer);
if (d == OVER) break;
printf("---> %d\n", d);
}
while (1)
{
d = get (&buffer);
if (d == OVER)
break;
printf ("---> %d\n", d);
}
return NULL;
}
int main(void)
int
main (void)
{
pthread_t th_a, th_b;
void * retval;
void *retval;
init(&buffer);
init (&buffer);
/* Create the threads */
pthread_create(&th_a, NULL, producer, 0);
pthread_create(&th_b, NULL, consumer, 0);
pthread_create (&th_a, NULL, producer, 0);
pthread_create (&th_b, NULL, consumer, 0);
/* Wait until producer and consumer finish. */
pthread_join(th_a, &retval);
pthread_join(th_b, &retval);
pthread_join (th_a, &retval);
pthread_join (th_b, &retval);
return 0;
}