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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
Download Patch File Download Diff File Expand all files Collapse all files

37
linuxthreads/Examples/ex1.c
View File

@ -7,29 +7,36 @@
#include <unistd.h>
#include "pthread.h"
void * process(void * arg)
static void *
process (void *arg)
{
int i;
fprintf(stderr, "Starting process %s\n", (char *) arg);
for (i = 0; i < 10000; i++) {
write(1, (char *) arg, 1);
}
fprintf (stderr, "Starting process %s\n", (char *) arg);
for (i = 0; i < 10000; i++)
{
write (1, (char *) arg, 1);
}
return NULL;
}
int main(void)
int
main (void)
{
int retcode;
pthread_t th_a, th_b;
void * retval;
void *retval;
retcode = pthread_create(&th_a, NULL, process, (void *) "a");
if (retcode != 0) fprintf(stderr, "create a failed %d\n", retcode);
retcode = pthread_create(&th_b, NULL, process, (void *) "b");
if (retcode != 0) fprintf(stderr, "create b failed %d\n", retcode);
retcode = pthread_join(th_a, &retval);
if (retcode != 0) fprintf(stderr, "join a failed %d\n", retcode);
retcode = pthread_join(th_b, &retval);
if (retcode != 0) fprintf(stderr, "join b failed %d\n", retcode);
retcode = pthread_create (&th_a, NULL, process, (void *) "a");
if (retcode != 0)
fprintf (stderr, "create a failed %d\n", retcode);
retcode = pthread_create (&th_b, NULL, process, (void *) "b");
if (retcode != 0)
fprintf (stderr, "create b failed %d\n", retcode);
retcode = pthread_join (th_a, &retval);
if (retcode != 0)
fprintf (stderr, "join a failed %d\n", retcode);
retcode = pthread_join (th_b, &retval);
if (retcode != 0)
fprintf (stderr, "join b failed %d\n", retcode);
return 0;
}

6
linuxthreads/Examples/ex13.c
View File

@ -32,7 +32,7 @@ struct thr_ctrl
int retval;
};
void
static void
dump_mut (pthread_mutex_t * mut)
{
int i;
@ -43,7 +43,7 @@ dump_mut (pthread_mutex_t * mut)
};
/* Helper, the opposite of pthread_cond_wait (cond, mut). */
void
static void
pthr_cond_signal_mutex (pthread_cond_t * cond, pthread_mutex_t * mut)
{
int err;
@ -59,7 +59,7 @@ pthr_cond_signal_mutex (pthread_cond_t * cond, pthread_mutex_t * mut)
}
void *
static void *
thread_start (void *ptr)
{
struct thr_ctrl *tc = ptr;

2
linuxthreads/Examples/ex14.c
View File

@ -92,7 +92,7 @@ worker (void *arg)
#define TEST_FUNCTION do_test ()
#define TIMEOUT 60
int
static int
do_test (void)
{
pthread_t threads[NTHREADS];

109
linuxthreads/Examples/ex2.c
View File

@ -10,61 +10,66 @@
/* Circular buffer of integers. */
struct prodcons {
int buffer[BUFFER_SIZE]; /* the actual data */
pthread_mutex_t lock; /* mutex ensuring exclusive access to buffer */
int readpos, writepos; /* positions for reading and writing */
pthread_cond_t notempty; /* signaled when buffer is not empty */
pthread_cond_t notfull; /* signaled when buffer is not full */
struct prodcons
{
int buffer[BUFFER_SIZE]; /* the actual data */
pthread_mutex_t lock; /* mutex ensuring exclusive access to buffer */
int readpos, writepos; /* positions for reading and writing */
pthread_cond_t notempty; /* signaled when buffer is not empty */
pthread_cond_t notfull; /* signaled when buffer is not full */
};
/* Initialize a buffer */
void init(struct prodcons * b)
static void
init (struct prodcons *b)
{
pthread_mutex_init(&b->lock, NULL);
pthread_cond_init(&b->notempty, NULL);
pthread_cond_init(&b->notfull, NULL);
pthread_mutex_init (&b->lock, NULL);
pthread_cond_init (&b->notempty, NULL);
pthread_cond_init (&b->notfull, NULL);
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)
{
pthread_mutex_lock(&b->lock);
pthread_mutex_lock (&b->lock);
/* Wait until buffer is not full */
while ((b->writepos + 1) % BUFFER_SIZE == b->readpos) {
pthread_cond_wait(&b->notfull, &b->lock);
/* pthread_cond_wait reacquired b->lock before returning */
}
while ((b->writepos + 1) % BUFFER_SIZE == b->readpos)
{
pthread_cond_wait (&b->notfull, &b->lock);
/* pthread_cond_wait reacquired b->lock before returning */
}
/* 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 is now not empty */
pthread_cond_signal(&b->notempty);
pthread_mutex_unlock(&b->lock);
pthread_cond_signal (&b->notempty);
pthread_mutex_unlock (&b->lock);
}
/* Read and remove an integer from the buffer */
int get(struct prodcons * b)
static int
get (struct prodcons *b)
{
int data;
pthread_mutex_lock(&b->lock);
pthread_mutex_lock (&b->lock);
/* Wait until buffer is not empty */
while (b->writepos == b->readpos) {
pthread_cond_wait(&b->notempty, &b->lock);
}
while (b->writepos == b->readpos)
{
pthread_cond_wait (&b->notempty, &b->lock);
}
/* 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 is now not full */
pthread_cond_signal(&b->notfull);
pthread_mutex_unlock(&b->lock);
pthread_cond_signal (&b->notfull);
pthread_mutex_unlock (&b->lock);
return data;
}
@ -75,39 +80,45 @@ 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;
}

84
linuxthreads/Examples/ex4.c
View File

@ -14,10 +14,11 @@
#if 0
char * str_accumulate(char * s)
char *
str_accumulate (char *s)
{
static char accu[1024] = { 0 };
strcat(accu, s);
strcat (accu, s);
return accu;
}
@ -35,73 +36,80 @@ static pthread_key_t str_key;
static pthread_once_t str_alloc_key_once = PTHREAD_ONCE_INIT;
/* Forward functions */
static void str_alloc_key(void);
static void str_alloc_destroy_accu(void * accu);
static void str_alloc_key (void);
static void str_alloc_destroy_accu (void *accu);
/* Thread-safe version of str_accumulate */
char * str_accumulate(const char * s)
static char *
str_accumulate (const char *s)
{
char * accu;
char *accu;
/* Make sure the key is allocated */
pthread_once(&str_alloc_key_once, str_alloc_key);
pthread_once (&str_alloc_key_once, str_alloc_key);
/* Get the thread-specific data associated with the key */
accu = (char *) pthread_getspecific(str_key);
accu = (char *) pthread_getspecific (str_key);
/* It's initially NULL, meaning that we must allocate the buffer first. */
if (accu == NULL) {
accu = malloc(1024);
if (accu == NULL) return NULL;
accu[0] = 0;
/* Store the buffer pointer in the thread-specific data. */
pthread_setspecific(str_key, (void *) accu);
printf("Thread %lx: allocating buffer at %p\n", pthread_self(), accu);
}
if (accu == NULL)
{
accu = malloc (1024);
if (accu == NULL)
return NULL;
accu[0] = 0;
/* Store the buffer pointer in the thread-specific data. */
pthread_setspecific (str_key, (void *) accu);
printf ("Thread %lx: allocating buffer at %p\n", pthread_self (), accu);
}
/* Now we can use accu just as in the non thread-safe code. */
strcat(accu, s);
strcat (accu, s);
return accu;
}
/* Function to allocate the key for str_alloc thread-specific data. */
static void str_alloc_key(void)
static void
str_alloc_key (void)
{
pthread_key_create(&str_key, str_alloc_destroy_accu);
printf("Thread %lx: allocated key %d\n", pthread_self(), str_key);
pthread_key_create (&str_key, str_alloc_destroy_accu);
printf ("Thread %lx: allocated key %d\n", pthread_self (), str_key);
}
/* Function to free the buffer when the thread exits. */
/* Called only when the thread-specific data is not NULL. */
static void str_alloc_destroy_accu(void * accu)
static void
str_alloc_destroy_accu (void *accu)
{
printf("Thread %lx: freeing buffer at %p\n", pthread_self(), accu);
free(accu);
printf ("Thread %lx: freeing buffer at %p\n", pthread_self (), accu);
free (accu);
}
/* Test program */
void * process(void * arg)
static void *
process (void *arg)
{
char * res;
res = str_accumulate("Result of ");
res = str_accumulate((char *) arg);
res = str_accumulate(" thread");
printf("Thread %lx: \"%s\"\n", pthread_self(), res);
char *res;
res = str_accumulate ("Result of ");
res = str_accumulate ((char *) arg);
res = str_accumulate (" thread");
printf ("Thread %lx: \"%s\"\n", pthread_self (), res);
return NULL;
}
int main(int argc, char ** argv)
int
main (int argc, char **argv)
{
char * res;
char *res;
pthread_t th1, th2;
res = str_accumulate("Result of ");
pthread_create(&th1, NULL, process, (void *) "first");
pthread_create(&th2, NULL, process, (void *) "second");
res = str_accumulate("initial thread");
printf("Thread %lx: \"%s\"\n", pthread_self(), res);
pthread_join(th1, NULL);
pthread_join(th2, NULL);
res = str_accumulate ("Result of ");
pthread_create (&th1, NULL, process, (void *) "first");
pthread_create (&th2, NULL, process, (void *) "second");
res = str_accumulate ("initial thread");
printf ("Thread %lx: \"%s\"\n", pthread_self (), res);
pthread_join (th1, NULL);
pthread_join (th2, NULL);
return 0;
}

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;
}

33
linuxthreads/Examples/ex7.c
View File

@ -9,32 +9,37 @@
#include <stdlib.h>
#include <pthread.h>
#define NTHREADS 20 /* number of threads */
#define NTHREADS 20 /* number of threads */
static void *thread(void *arg)
static void *
thread (void *arg)
{
printf("thread terminating\n");
printf ("thread terminating\n");
return 0;
}
void cleanup(void)
static void
cleanup (void)
{
printf("atexit handler called\n");
printf ("atexit handler called\n");
}
int main(void)
int
main (void)
{
int i;
atexit(cleanup);
atexit (cleanup);
for (i = 0; i < NTHREADS; i++) {
pthread_t id;
if (pthread_create(&id, 0, thread, 0) != 0) {
fprintf(stderr, "pthread_create failed\n");
abort();
for (i = 0; i < NTHREADS; i++)
{
pthread_t id;
if (pthread_create (&id, 0, thread, 0) != 0)
{
fprintf (stderr, "pthread_create failed\n");
abort ();
}
}
}
pthread_exit(0);
pthread_exit (0);
}