协程切换

Breakpoint 2, 0x00007fffedb6c090 in swoole::Context::Context(unsigned long, void (*)(void*), void*)@plt ()
   from /usr/local/phpfork/lib/php/extensions/debug-non-zts-20170718/swoole.so
(gdb) bt
#0  0x00007fffedb6c090 in swoole::Context::Context(unsigned long, void (*)(void*), void*)@plt ()
   from /usr/local/phpfork/lib/php/extensions/debug-non-zts-20170718/swoole.so
#1  0x00007fffedc207b1 in swoole::Coroutine::Coroutine (this=0x17a8540, fn=0x7fffedc1cdb2 <swoole::PHPCoroutine::main_func(void*)>, private_data=0x7fffffffa0a0)
    at /home/dinosaur/swoole-src/include/coroutine.h:204
#2  0x00007fffedc205ee in swoole::Coroutine::create (fn=0x7fffedc1cdb2 <swoole::PHPCoroutine::main_func(void*)>, args=0x7fffffffa0a0)
    at /home/dinosaur/swoole-src/include/coroutine.h:121
#3  0x00007fffedc1d7d0 in swoole::PHPCoroutine::create (fci_cache=0x7fffffffa140, argc=0, argv=0x0) at /home/dinosaur/swoole-src/swoole_coroutine.cc:857
#4  0x00007fffedc1eebd in zif_swoole_coroutine_create (execute_data=0x7fffef61e090, return_value=0x7fffffffa1e0)
    at /home/dinosaur/swoole-src/swoole_coroutine.cc:964
#5  0x0000000000aaf137 in ZEND_DO_FCALL_BY_NAME_SPEC_RETVAL_UNUSED_HANDLER () at /home/dinosaur/Downloads/php-7.2.2/Zend/zend_vm_execute.h:738
#6  0x0000000000b42992 in execute_ex (ex=0x7fffef61e030) at /home/dinosaur/Downloads/php-7.2.2/Zend/zend_vm_execute.h:59743
#7  0x0000000000b47d9d in zend_execute (op_array=0x7fffef684b00, return_value=0x0) at /home/dinosaur/Downloads/php-7.2.2/Zend/zend_vm_execute.h:63760
#8  0x0000000000a3afe0 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /home/dinosaur/Downloads/php-7.2.2/Zend/zend.c:1496
#9  0x000000000098c749 in php_execute_script (primary_file=0x7fffffffc8c0) at /home/dinosaur/Downloads/php-7.2.2/main/main.c:2590
#10 0x0000000000b4b2a5 in do_cli (argc=2, argv=0x1561f20) at /home/dinosaur/Downloads/php-7.2.2/sapi/cli/php_cli.c:1011
#11 0x0000000000b4c491 in main (argc=2, argv=0x1561f20) at /home/dinosaur/Downloads/php-7.2.2/sapi/cli/php_cli.c:1404