Yes，it help me understand the code more clearly<br><br><div class="gmail_quote">在 2010年12月31日 下午7:18，eagle sbc <span dir="ltr"><<a href="mailto:sbc19861004@gmail.com">sbc19861004@gmail.com</a>></span>写道：<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
hi, nn hust:<div> First, the 'cf->ctx' is a context variable. When in the DIRECT_CONF or MAIN_CONF context, it point to 'void*[MAX_MODULE]' array, while in the HTTP context, it point to a 'ngx_http_conf_ctx_t', which is a structure with there pointers each point to a 'void *[MAX_HTTP_MODULE]' array. Other CORE module act the same as HTTP. </div>
<div> I draw a diagram to make seems more clear :</div><div><img src="?ui=2&ik=cef46da814&view=att&th=12d3c3f2fcd7206c&attid=0.0.1&disp=emb&realattid=ii_12d3c1aca19fa422&zw" alt="cf.jpg" title="cf.jpg" width="420" height="317"><br>
</div><div><br></div><div>Every module structure has a 'index' member and 'ctx_index' member. 'index' indicate its own data position in the glocal 'void *' array, while 'ctx_index' indicate the context related. (According to what I understand, The module type already choose which kind of array it will use, so the two index is not necessary)</div>
<div><br></div><div>The different between DIRECT and MAIN is: DIRECT means the memory is already allocated, and the cmd's set function can directly use it, so pass the pointer to the allocated memory; MAIN means the memory to be allocated depend on the module, so pass the pointer to the pointer in the array.</div>
<div><br></div><div>cmd's 'conf' member indicate which context it will store its data. As in HTTP, we can choose MAIN, SRV, LOC. </div><div><br>And I think the code is now easy to understand.<br><div class="gmail_quote">
<div><div></div><div class="h5">
On Fri, Dec 31, 2010 at 4:46 PM, nn hust <span dir="ltr"><<a href="mailto:nzjemail@gmail.com" target="_blank">nzjemail@gmail.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div></div><div class="h5">
I am confused by the multi dimensions pointer of the module configure structure<div><br></div><div><div>if (cmd->type & NGX_DIRECT_CONF) {</div><div> conf = ((void **) cf->ctx)[ngx_modules[i]->index];</div>
<div><br></div><div> } else if (cmd->type & NGX_MAIN_CONF) {</div><div> conf = &(((void **) cf->ctx)[ngx_modules[i]->index]);</div><div><br></div><div> } else if (cf->ctx) {</div>
<div> confp = *(void **) ((char *) cf->ctx + cmd->conf);</div><div><br></div><div> if (confp) {</div><div> conf = confp[ngx_modules[i]->ctx_index];</div><div> }</div>
<div> }</div><div><br></div><div> rv = cmd->set(cf, cmd, conf);</div></div><div><br></div><div><br></div><div><br></div>
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