swoole线程和进程

pstree -a | grep php

|   |       `-php server.php   主进程   
  |   |           |-php server.php   管理线程  worker线程死掉后 可以重启一个worker线程
  |   |           |   `-php server.php
  |   |           `-{php}

ps -aux

root      3797  0.0  1.5  42776 16240 pts/0    Sl+  21:50   0:00 /usr/local/php-5.6.8/bin/php server.php
root      3798  0.0  0.2  32024  2116 pts/0    S+   21:50   0:00 /usr/local/php-5.6.8/bin/php server.php
root      3800  0.0  0.2  32368  2360 pts/0    S+   21:50   0:00 /usr/local/php-5.6.8/bin/php server.php

[[email protected] ~]# strace -p 3797 （查看目前进程在干嘛）
Process 3797 attached - interrupt to quit
poll([{fd=5, events=POLLIN}], 1, 1000)  = 0 (Timeout)
time(NULL)                              = 1431008802
poll([{fd=5, events=POLLIN}], 1, 1000)  = 0 (Timeout)
time(NULL)                              = 1431008803
poll([{fd=5, events=POLLIN}], 1, 1000)  = 0 (Timeout)
time(NULL)                              = 1431008804
poll([{fd=5, events=POLLIN}], 1, 1000)  = 0 (Timeout)
time(NULL)                              = 1431008805
poll([{fd=5, events=POLLIN}], 1, 1000)  = 0 (Timeout)
time(NULL)                              = 1431008806

[[email protected] ~]# strace -p 3798
Process 3798 attached - interrupt to quit
wait4(-1, 

线程是可以共享进程的内存和资源

master  主进程　　

manager  管理线程

worker