Linux 线程 动画

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <curses.h>#include <pthread.h>#include <unistd.h>#define MAXMSG      24#define TUNIT       20000struct propset{char *str;int row;int delay;int dir;};pthread_mutex_t mx = PTHREAD_MUTEX_INITIALIZER;int setup(int nstrings,char*string[],struct propset props[]);void *animate(void*);int main(int ac,char *av[]){int c;pthread_t threads[MAXMSG];struct propset props[MAXMSG];int num_msg;int i;if(ac == 1){printf("usage:tanimate string...\n");exit(1);}num_msg = setup(ac-1,av+1,props);/* create all the threads */for(i=0;i<num_msg;i++){if(pthread_create(&threads[i],NULL,animate,&props[i])){fprintf(stderr,"error creating thread");endwin();exit(0);}}while(1){char c  = getch();if(c == 'Q') break;if(c == ' ')for(i=0;i<num_msg;i++)props[i].dir = -props[i].dir;if(c>='0' && c<='9'){i=c-'0';if(i<num_msg)props[i].dir = -props[i].dir;}}/* cancel all the threads */pthread_mutex_lock(&mx);for(i=0;i<num_msg;i++)pthread_cancel(threads[i]);endwin();return 0;}int setup(int nstrings,char *strings[],struct propset props[]){int num_msg = (nstrings > MAXMSG ? MAXMSG : nstrings);int i;/* assign rows and velocities to each string */srand(getpid());for(i=0;i<num_msg;i++){props[i].str = strings[i];props[i].row = rand()%24-1;props[i].delay = 1+rand()%5;props[i].dir = (rand()%2?1:-1);}/* set up curses */initscr();crmode();noecho();clear();mvprintw(LINES-1,0,"'Q' to quit,'0'..'%d' to bounce",num_msg-1);return num_msg;}/* the code that runs in each thread */void *animate(void *arg){struct propset *info = arg;int len = strlen(info->str)+2;int col = rand()%(COLS - len - 3);while(1){usleep(info->delay*TUNIT);pthread_mutex_lock(&mx);move(info->row,col);addch(' ');addstr(info->str);addch(' ');move(LINES-1,COLS-1);refresh();pthread_mutex_unlock(&mx);/* move item to next column and check for bouncing */col+=info->dir;if(col<=0 && info->dir == -1)info->dir=1;else if(col + len >= COLS && info->dir == 1)info->dir=-1;}}

gcc tanimate.c -lcurses -lpthread -o tanimate