为什么我的上一个帖子没有终止？
我想同时启动所有线程，所以我有十个线程，一旦创建就会进入休眠状态。一旦创建了所有线程，我就会唤醒所有线程以开始处理数据。线程完成除了最后一个线程，线程＃9。有谁知道为什么最后一个帖子没有终止并加入所有其他pthreads？
输出：
------------------Theatre Seating----------------
0000 0001 0002 0003 0004 0005 0006 0007 0008 0009
0010 0011 0012 0013 0014 0015 0016 0017 0018 0019
0020 0021 0022 0023 0024 0025 0026 0027 0028 0029
0030 0031 0032 0033 0034 0035 0036 0037 0038 0039
0040 0041 0042 0043 0044 0045 0046 0047 0048 0049
0050 0051 0052 0053 0054 0055 0056 0057 0058 0059
0060 0061 0062 0063 0064 0065 0066 0067 0068 0069
0070 0071 0072 0073 0074 0075 0076 0077 0078 0079
0080 0081 0082 0083 0084 0085 0086 0087 0088 0089
0090 0091 0092 0093 0094 0095 0096 0097 0098 0099
------------------End of Seating----------------
Enter N value of Customers: 2
Number of Customers: 2
thread #0: seller_type1->st = H
thread #1: seller_type1->st = M
thread #2: seller_type1->st = M
thread #3: seller_type1->st = M
thread #4: seller_type1->st = L
thread #5: seller_type1->st = L
thread #6: seller_type1->st = L
thread #7: seller_type1->st = L
thread #8: seller_type1->st = L
thread #9: seller_type1->st = L
Seller type: H
thread #0: Work done
Seller type: M
Seller type: M
Seller name: M1
Seller type: M
Seller name: M2
Seller type: L
Seller type: L
thread #1: Work done
Seller type: L
Seller name: M3
Seller type: L
Seller type: L
thread #2: Work done
thread #4: Work done
thread #5: Work done
thread #6: Work done
thread #3: Work done
thread #7: Work done
thread #8: Work done
代码：
* Created on July 4, 2016, 11:27 AM
*/
#include <stdio.h>
#include <pthread.h>
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
// seller thread to serve one time slice (1 minute)
#include <stdlib.h>
//Global variables
//Number of Customers
int N;
char * theatre[][10] = {
{"0000", "0001", "0002", "0003", "0004", "0005", "0006", "0007", "0008", "0009"},
{"0010", "0011", "0012", "0013", "0014", "0015", "0016", "0017", "0018", "0019"},
{"0020", "0021", "0022", "0023", "0024", "0025", "0026", "0027", "0028", "0029"},
{"0030", "0031", "0032", "0033", "0034", "0035", "0036", "0037", "0038", "0039"},
{"0040", "0041", "0042", "0043", "0044", "0045", "0046", "0047", "0048", "0049"},
{"0050", "0051", "0052", "0053", "0054", "0055", "0056", "0057", "0058", "0059"},
{"0060", "0061", "0062", "0063", "0064", "0065", "0066", "0067", "0068", "0069"},
{"0070", "0071", "0072", "0073", "0074", "0075", "0076", "0077", "0078", "0079"},
{"0080", "0081", "0082", "0083", "0084", "0085", "0086", "0087", "0088", "0089"},
{"0090", "0091", "0092", "0093", "0094", "0095", "0096", "0097", "0098", "0099"}
};
struct seller_type {
char st;
int tid;
int numid;
char * name;
};
void fillSeat()
{
char *c1 = theatre[0][2];
char *d1 = theatre[0][0];
//asprintf(&d1, "%c%c%c%d\n",c1[0],c1[1],seller_type1->st,seller_type1->tid);
printf("D : %s", d1);
}
void *sell(void *arg)
{
struct seller_type *seller_type1 = arg;
int i;
i = 0;
printf("thread #%d: seller_type1->st = %c\n", seller_type1->tid,
seller_type1->st);
// do work
while (i == 0) {
pthread_mutex_lock(&mutex);
pthread_cond_wait(&cond, &mutex);
pthread_mutex_unlock(&mutex);
switch (seller_type1->st) {
case 'H':
printf("Seller type: H\n");
//printf("Seller name: %s\n", seller_type1->name);
//Begin Selling tickets
i = 1;
//set time;
break;
case 'M':
printf("Seller type: M\n");
printf("Seller name: %s\n", seller_type1->name);
//Begin Selling tickets
i = 1;
//set time;
break;
case 'L':
printf("Seller type: L\n");
//printf("Seller name: %s\n", seller_type1->name);
//Begin Selling tickets
i = 1;
//set time;
break;
}
}
printf("thread #%d: Work done\n", seller_type1->tid);
return NULL;
}
void displayTheatre()
{
int i,j;
printf("\n------------------Theatre Seating----------------\n\n");
for(i = 0;i<10;i++)
{
for(j = 0;j<10;j++){
printf("%s ",theatre[i][j]);
}
printf("\n");
}
printf("\n------------------End of Seating----------------\n\n");
}
void wakeup_all_seller_threads()
{
pthread_mutex_lock(&mutex);
pthread_cond_broadcast(&cond);
pthread_mutex_unlock(&mutex);
}
int main()
{
N = 0;
int i = 0;
struct seller_type *seller_type1;
displayTheatre();
pthread_t tids[10];
seller_type1 = calloc(10, sizeof(struct seller_type));
printf("Enter N value of Customers: ");
scanf("%d", &N);
printf("Number of Customers: %d\n", N);
// All error handling ommitted! Yes, ALL!
seller_type1[0].st = 'H';
seller_type1[0].tid = 0;
seller_type1[0].numid = 0;
asprintf(&seller_type1[0].name, "%c%d\n",seller_type1[0].st,seller_type1[0].numid);
pthread_create(&tids[0], NULL, sell, &seller_type1[0]);
for (i = 1; i < 4; i++) {
seller_type1[i].st = 'M';
seller_type1[i].tid = i;
seller_type1[i].numid = i;
asprintf(&seller_type1[i].name, "%c%d\n",seller_type1[i].st,seller_type1[i].numid);
pthread_create(&tids[i], NULL, sell, &seller_type1[i]);
}
for (i = 4; i < 10; i++) {
seller_type1[i].st = 'L';
seller_type1[i].tid = i;
seller_type1[i].numid = i-3;
asprintf(&seller_type1[i].name, "%c%d\n",seller_type1[i].st,seller_type1[i].numid);
pthread_create(&tids[i], NULL, sell, &seller_type1[i]);
}
wakeup_all_seller_threads();
//puts("All threads Start");
// wait for all seller threads to exit
for (i = 0; i < 10; i++) {
pthread_join(tids[i], NULL);
//printf("Thread %d joined\n", i);
}
//puts("All threads joined");
exit(EXIT_SUCCESS);
}
答案 0 :(得分：0)
线程现在有效。删除了pthread_cond，并且主锁定了互斥锁。创建线程并在执行任何其他操作之前锁定并解锁互斥锁。然后主要解锁互斥锁，同时启动它们。
输出：
------------------Theatre Seating----------------
0000 0001 0002 0003 0004 0005 0006 0007 0008 0009
0010 0011 0012 0013 0014 0015 0016 0017 0018 0019
0020 0021 0022 0023 0024 0025 0026 0027 0028 0029
0030 0031 0032 0033 0034 0035 0036 0037 0038 0039
0040 0041 0042 0043 0044 0045 0046 0047 0048 0049
0050 0051 0052 0053 0054 0055 0056 0057 0058 0059
0060 0061 0062 0063 0064 0065 0066 0067 0068 0069
0070 0071 0072 0073 0074 0075 0076 0077 0078 0079
0080 0081 0082 0083 0084 0085 0086 0087 0088 0089
0090 0091 0092 0093 0094 0095 0096 0097 0098 0099
------------------End of Seating----------------
Enter N value of Customers: 3
Number of Customers: 3
thread #0: seller_type1->st = H
thread #1: seller_type1->st = M
thread #2: seller_type1->st = M
thread #3: seller_type1->st = M
thread #4: seller_type1->st = L
thread #5: seller_type1->st = L
thread #6: seller_type1->st = L
thread #7: seller_type1->st = L
thread #8: seller_type1->st = L
thread #9: seller_type1->st = L
Seller type: H
Seller type: M
Seller type: M
Seller type: M
Seller name: H0
Seller type: L
Seller name: M1
Seller type: L
Seller type: L
Seller name: M2
Seller type: L
Seller name: M3
Seller type: L
Seller type: L
thread #0: Work done
Seller name: L1
thread #1: Work done
Seller name: L2
Seller name: L3
thread #2: Work done
Seller name: L4
thread #3: Work done
Seller name: L5
Seller name: L6
thread #4: Work done
thread #5: Work done
thread #6: Work done
thread #7: Work done
thread #8: Work done
thread #9: Work done
RUN FINISHED; exit value 0; real time: 1s; user: 0ms; system: 0ms
代码：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/*
* File: ticketsellers.c
* Author: iantheflyinghawaiian
*
* Created on July 4, 2016, 11:27 AM
*/
#include <stdio.h>
#include <pthread.h>
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
// seller thread to serve one time slice (1 minute)
#include <stdlib.h>
//Global variables
//Number of Customers
int N;
char * theatre[][10] = {
{"0000", "0001", "0002", "0003", "0004", "0005", "0006", "0007", "0008", "0009"},
{"0010", "0011", "0012", "0013", "0014", "0015", "0016", "0017", "0018", "0019"},
{"0020", "0021", "0022", "0023", "0024", "0025", "0026", "0027", "0028", "0029"},
{"0030", "0031", "0032", "0033", "0034", "0035", "0036", "0037", "0038", "0039"},
{"0040", "0041", "0042", "0043", "0044", "0045", "0046", "0047", "0048", "0049"},
{"0050", "0051", "0052", "0053", "0054", "0055", "0056", "0057", "0058", "0059"},
{"0060", "0061", "0062", "0063", "0064", "0065", "0066", "0067", "0068", "0069"},
{"0070", "0071", "0072", "0073", "0074", "0075", "0076", "0077", "0078", "0079"},
{"0080", "0081", "0082", "0083", "0084", "0085", "0086", "0087", "0088", "0089"},
{"0090", "0091", "0092", "0093", "0094", "0095", "0096", "0097", "0098", "0099"}
};
struct seller_type {
char st;
int tid;
int numid;
char * name;
};
void fillSeat()
{
char *c1 = theatre[0][2];
char *d1 = theatre[0][0];
//asprintf(&d1, "%c%c%c%d\n",c1[0],c1[1],seller_type1->st,seller_type1->tid);
printf("D : %s", d1);
}
void *sell(void *arg)
{
struct seller_type *seller_type1 = arg;
int i;
i = 0;
printf("thread #%d: seller_type1->st = %c\n", seller_type1->tid,
seller_type1->st);
// do work
while (i == 0) {
pthread_mutex_lock(&mutex);
//pthread_cond_wait(&cond, &mutex);
pthread_mutex_unlock(&mutex);
switch (seller_type1->st) {
case 'H':
printf("Seller type: H\n");
printf("Seller name: %s\n", seller_type1->name);
//Begin Selling tickets
i = 1;
//set time;
break;
case 'M':
printf("Seller type: M\n");
printf("Seller name: %s\n", seller_type1->name);
//Begin Selling tickets
i = 1;
//set time;
break;
case 'L':
printf("Seller type: L\n");
printf("Seller name: %s\n", seller_type1->name);
//Begin Selling tickets
i = 1;
//set time;
break;
}
}
printf("thread #%d: Work done\n", seller_type1->tid);
return NULL;
}
void displayTheatre()
{
int i,j;
printf("\n------------------Theatre Seating----------------\n\n");
for(i = 0;i<10;i++)
{
for(j = 0;j<10;j++){
printf("%s ",theatre[i][j]);
}
printf("\n");
}
printf("\n------------------End of Seating----------------\n\n");
}
void wakeup_all_seller_threads()
{
//pthread_mutex_lock(&mutex);
//pthread_cond_wait(&cond, &mutex);
//pthread_cond_broadcast(&cond);
pthread_mutex_unlock(&mutex);
}
void lockup_all_seller_threads()
{
pthread_mutex_lock(&mutex);
//pthread_cond_wait(&cond, &mutex);
//pthread_cond_broadcast(&cond);
//pthread_mutex_unlock(&mutex);
}
int main()
{
lockup_all_seller_threads();
N = 0;
int i = 0;
struct seller_type *seller_type1;
displayTheatre();
pthread_t tids[10];
seller_type1 = calloc(10, sizeof(struct seller_type));
printf("Enter N value of Customers: ");
scanf("%d", &N);
printf("Number of Customers: %d\n", N);
// All error handling ommitted! Yes, ALL!
seller_type1[0].st = 'H';
seller_type1[0].tid = 0;
seller_type1[0].numid = 0;
asprintf(&seller_type1[0].name, "%c%d\n",seller_type1[0].st,seller_type1[0].numid);
pthread_create(&tids[0], NULL, sell, &seller_type1[0]);
for (i = 1; i < 4; i++) {
seller_type1[i].st = 'M';
seller_type1[i].tid = i;
seller_type1[i].numid = i;
asprintf(&seller_type1[i].name, "%c%d\n",seller_type1[i].st,seller_type1[i].numid);
pthread_create(&tids[i], NULL, sell, &seller_type1[i]);
}
for (i = 4; i < 10; i++) {
seller_type1[i].st = 'L';
seller_type1[i].tid = i;
seller_type1[i].numid = i-3;
asprintf(&seller_type1[i].name, "%c%d\n",seller_type1[i].st,seller_type1[i].numid);
pthread_create(&tids[i], NULL, sell, &seller_type1[i]);
}
wakeup_all_seller_threads();
//puts("All threads Start");
// wait for all seller threads to exit
for (i = 0; i < 10; i++) {
pthread_join(tids[i], NULL);
//printf("Thread %d joined\n", i);
}
//puts("All threads joined");
exit(EXIT_SUCCESS);
}