ub_server_running

2016-06-22 11:31:05   0  举报

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ub_server_running 是一个用于检查服务器运行状态的变量。当服务器正常运行时，该变量的值为 True，表示服务器正在接收和处理请求；而当服务器出现故障或停止运行时，该变量的值为 False，表示服务器当前不可用。通过监控 ub_server_running 变量的值，可以实时了解服务器的运行状况，从而确保应用程序的稳定性和可靠性。在实际开发中，通常会将 ub_server_running 与其他功能模块相结合，例如自动切换到备用服务器、发送告警通知等，以提高系统的容错能力和可用性。总之，ub_server_running 是一个简单而实用的工具，对于保证服务器正常运行至关重要。

作者其他创作

大纲/内容

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void* user_buf

....................

void* parent

指针service_handler_base*

thread_data

从client fd读入请求内容

12 pointers 1 per threadeach stores addr of athread_instance_data objadjacently allocated in heap

type=void *size=8 bytes

...........................

nshead

mcpack

ub_server_pdata_t

int fd

字符串\"create_direct_trans\"

一个thread的client fd读入的请求放入本thread的read buffer发往该thread的thread_instance_data里面的handlers_ map里面的对应的service_handler_wrapper对象中的handler对象，比如create_direct_trans_service对象的handle函数处理处理的响应也存入本thread的write buffer最终发给本thread的client fd

内部调用obj-handle()

void* data

thread_instance_data

create_direct_trans_service obj

pay_direct_trans_service obj

pthread_t pid

void* write_buf

12 thread_instance_data obj separately allocated in heap

associate with

g_pkey for thread 1

按nshead+mcpack协议解析请求内容供实际各service对象的handle函数内部消费

.................................

ub_server_handle

Stack

void* usersef_buf

each per-thread pointerstores addr of another pointer storing the addr of the per-thread thread_instance_data obj

type=void*size=sizeof(/thread_instance_data**)

1)inside one thread_instance_data its thread_data member variable is used by all service objs like create_direct_trans_serice for construction2)members of thread_data like sql_db_session_map are initialized inside constructors of service classes like create_direct_trans_service

int (* cb_native)()

thread_instance_data for thread 0newed inside dispatcher::create_thread_datahold own map of cmd-service_handler_wrapper*

total size=12*sizeof(void *)there are 12 pointers1 per threadadjacently allocated in heap

.........................

int sev_sock

13 per-thread data key12 worker threads1 main thread

字符串\"pay_direct_trans\"

void* pool

each thread_instance_data objhas its own set of pointerspointing to their own set of service objs like create_direct_trans_serivce

void* read_buf

Heap

g_pkey for thread 12