{"id":1228,"date":"2022-03-07T15:46:04","date_gmt":"2022-03-07T07:46:04","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=1228"},"modified":"2022-06-11T02:27:57","modified_gmt":"2022-06-10T18:27:57","slug":"st%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90-st_thread_exit","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=1228","title":{"rendered":"ST\u6e90\u7801\u5206\u6790-st_thread_exit"},"content":{"rendered":"\n<p>\u672c\u6587 \u57fa\u4e8e \u547d\u4ee4<code class=\"prettyprint\" >.\/obj\/lookupdns www.xianwaizhiyin.net<\/code> \u505a\u8bb2\u89e3\uff0c\u53ea\u67e5\u8be2\u4e00\u4e2a\u57df\u540d\u3002<\/p>\n\n\n\n<p>\u672c\u6587 \u4e3b\u8981\u5206\u6790 <code class=\"prettyprint\" >st_thread_exit()<\/code> \u51fd\u6570\u7684\u5185\u90e8\u5b9e\u73b0\u3002\u8bf7\u770b\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"477\" height=\"441\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-8-1.png\" alt=\"\" class=\"wp-image-1231\"\/><\/figure>\n\n\n\n<p><code class=\"prettyprint\" >st_thread_exit()<\/code> \u7b2c\u4e00\u6b21\u53ea\u4f1a\u6267\u884c <code>_ST_SWITCH_CONTEXT(thread);<\/code> \u8fd9\u4e2a\u4ee3\u7801\u3002\u5176\u4ed6\u903b\u8f91\u5148\u4e0d\u7ba1\uff0c\u7b2c\u4e00\u6b21\u4e0d\u4f1a\u8dd1\u8fdb\u53bb\uff0c\u6700\u540e\u9762\u6709\u4e00\u4e2a\u9012\u5f52\u8c03\u7528\u7684\u3002<\/p>\n\n\n\n<p>\u4e0b\u9762\u8be6\u7ec6\u8bb2\u89e3 <code class=\"prettyprint\" >_ST_SWITCH_CONTEXT()<\/code> \u51fd\u6570\u7684\u5b9e\u73b0\uff0c\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >\/*\n * Switch away from the current thread context by saving its state and\n * calling the thread scheduler\n *\/\n#define _ST_SWITCH_CONTEXT(_thread)       \\\n    ST_BEGIN_MACRO                        \\\n    ST_SWITCH_OUT_CB(_thread);            \\\n    if (!MD_SETJMP((_thread)-&gt;context)) { \\\n      _st_vp_schedule();                  \\\n    }                                     \\\n    ST_DEBUG_ITERATE_THREADS();           \\\n    ST_SWITCH_IN_CB(_thread);             \\\n    ST_END_MACRO<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u7684\u4ee3\u7801 <code class=\"prettyprint\" >ST_SWITCH_OUT_CB<\/code> \u5728\u672c\u6587\u547d\u4ee4\u4e2d\u4e0d\u4f1a\u6267\u884c\uff0c\u5148\u8df3\u8fc7\uff0c<code>MD_SETJMP<\/code> \u5c31\u662f\u4e4b\u524d\u8bb2\u7684 <code>_st_md_cxt_save<\/code>\uff0c\u628a\u5bc4\u5b58\u5668\u4fe1\u606f\u4fdd\u5b58\u8fdb\u53bb <code>jmp_buf<\/code> \u91cc\u9762\uff0c\u7136\u540e \u8c03 <code>_st_vp_schedule()<\/code>\u3002<strong>\u6240\u4ee5 _st_vp_schedule() \u662f\u91cd\u91cf\u7ea7\u51fd\u6570\uff0c\u9700\u8981\u4ed4\u7ec6\u8bb2\u89e3\u3002<\/strong><\/p>\n\n\n\n<p><code class=\"prettyprint\" >_st_vp_schedule()<\/code> \u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >void _st_vp_schedule(void)\n{\n  _st_thread_t *thread;\n\u200b\n  if (_ST_RUNQ.next != &amp;_ST_RUNQ) {\n    \/* Pull thread off of the run queue *\/\n    thread = _ST_THREAD_PTR(_ST_RUNQ.next);\n    _ST_DEL_RUNQ(thread);\n  } else {\n    \/* If there are no threads to run, switch to the idle thread *\/\n    thread = _st_this_vp.idle_thread;\n  }\n  ST_ASSERT(thread-&gt;state == _ST_ST_RUNNABLE);\n\u200b\n  \/* Resume the thread *\/\n  thread-&gt;state = _ST_ST_RUNNING;\n  _ST_RESTORE_CONTEXT(thread);\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>google_ads_content<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u73b0\u5728\u5f00\u59cb\u9010\u884c\u4ee3\u7801\u5206\u6790 <code class=\"prettyprint\" >_st_vp_schedule()<\/code>\u3002<\/p>\n\n\n\n<p><code class=\"prettyprint\" >_ST_RUNQ<\/code> \u662f <code>_st_this_vp.run_q<\/code>\uff0c\u8fd9\u91cc\u7684\u903b\u8f91\u662f\u53d6\u4e0b\u4e00\u4e2a\u534f\u7a0b\uff0c<code>_st_this_vp.run_q<\/code> \u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1135\" height=\"802\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-8-2.png\" alt=\"\" class=\"wp-image-1232\"\/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c<code class=\"prettyprint\" >_st_this_vp.run_q<\/code> \u91cc\u9762\u53ea\u67091\u4e2a\u534f\u7a0b\uff0c<code>run_q.next.next<\/code> \u5c31\u5230\u5934\u4e86\uff0c\u662f\u56e0\u4e3a\u6211\u4eec <code>lookupdns<\/code> \u53ea\u67e5\u4e861\u4e2a\u57df\u540d\u3002<\/p>\n\n\n\n<p><code class=\"prettyprint\" >_ST_DEL_RUNQ(thread)<\/code> \u662f\u628a \u8fd9\u4e2a\u534f\u7a0b\u79fb\u9664\u51fa\u961f\u5217\uff0c\u56e0\u4e3a\u534f\u7a0b\u5df2\u7ecf\u62ff\u51fa\u6765\u4e86\uff0c\u5c31\u53ef\u4ee5\u8fd0\u884c\u8fd9\u4e2a\u534f\u7a0b\u4e86\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5 <code class=\"prettyprint\" >_st_vp_schedule<\/code> \u91cc\u9762\u7684\u91cd\u70b9\u5c31\u662f <code>_ST_RESTORE_CONTEXT()<\/code>\uff0c<code>_ST_RESTORE_CONTEXT<\/code> \u5c31\u662f\u6062\u590d\u4e4b\u524d\u534f\u7a0b\u7684\u4e0a\u4e0b\u6587\uff0c\u7136\u540e\u6267\u884c \u534f\u7a0b\u7684 <code>start<\/code> \u51fd\u6570\u7684\u3002<\/p>\n\n\n\n<p><code class=\"prettyprint\" >_ST_RESTORE_CONTEXT<\/code> \u7684\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >\/*\n * Restore a thread context that was saved by _ST_SWITCH_CONTEXT or\n * initialized by _ST_INIT_CONTEXT\n *\/\n#define _ST_RESTORE_CONTEXT(_thread)   \\\n    ST_BEGIN_MACRO                     \\\n    _ST_SET_CURRENT_THREAD(_thread);   \\\n    MD_LONGJMP((_thread)-&gt;context, 1); \\\n    ST_END_MACRO<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u8fd9\u4e2a\u5b8f\u53ea\u6709\u4e24\u53e5 \u4ee3\u7801\u3002<code class=\"prettyprint\" >_ST_SET_CURRENT_THREAD<\/code> \u5c31\u662f\u8bbe\u7f6e\u5f53\u524d\u534f\u7a0b\uff0c\u6bd4\u8f83\u7b80\u5355\uff0c\u7136\u540e\u5c31\u662f <code>MD_LONGJMP()<\/code> \u8c03\u7528\uff0c\u6240\u4ee5 <code>MD_LONGJMP<\/code> \u662f<code>\u91cd\u70b9\u51fd\u6570<\/code><\/p>\n\n\n\n<p><code class=\"prettyprint\" >MD_LONGJMP<\/code> \u5b9a\u4e49\u5982\u4e0b\uff0c\u58f0\u660e\u4e00\u4e0b\uff0c<code>MD_LONGJMP<\/code> \u6839\u636e\u4e0d\u540c\u5e73\u53f0\u6709\u4e0d\u540c\u7684\u5b9e\u73b0\uff0c\u6211\u7684\u662f Linux + x86_64\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >#define MD_LONGJMP(env, val) _st_md_cxt_restore(env, val)<\/code><\/pre>\n\n\n\n<p><code class=\"prettyprint\" >_st_md_cxt_restore<\/code> \u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >\/* _st_md_cxt_restore(__jmp_buf env, int val) *\/\n.globl _st_md_cxt_restore\n        .type _st_md_cxt_restore, @function\n        .align 16\n_st_md_cxt_restore:\n        \/*\n         * Restore registers.\n         *\/\n        movq (JB_RBX*8)(%rdi), %rbx\n        movq (JB_RBP*8)(%rdi), %rbp\n        movq (JB_R12*8)(%rdi), %r12\n        movq (JB_R13*8)(%rdi), %r13\n        movq (JB_R14*8)(%rdi), %r14\n        movq (JB_R15*8)(%rdi), %r15\n        \/* Set return value *\/\n        test %esi, %esi\n        mov $01, %eax\n        cmove %eax, %esi\n        mov %esi, %eax\n        movq (JB_PC*8)(%rdi), %rdx\n        movq (JB_RSP*8)(%rdi), %rsp\n        \/* Jump to saved PC *\/\n        jmpq *%rdx\n        .size _st_md_cxt_restore, .-_st_md_cxt_restore<\/code><\/pre>\n\n\n\n<p>\u5907\u6ce8\uff1a<code class=\"prettyprint\" >.align 16<\/code> \u7684\u4f5c\u7528 \u8bf7\u770b <a href=\"https:\/\/sourceware.org\/binutils\/docs-2.34\/as\/Align.html#Align\">\u300aAT&amp;T align\u624b\u518c\u300b<\/a><\/p>\n\n\n\n<p>\u901a\u8fc7 <code class=\"prettyprint\" >gdb<\/code> \u8c03\u8bd5\u6c47\u7f16\u53ef\u4ee5\u770b\u5230\uff0c<code>_st_md_cxt_restore<\/code> \u7684\u4e24\u4e2a\u53c2\u6570 <code>env<\/code> \u8ddf <code>val<\/code> \u5206\u522b \u4f20\u8fdb\u53bb\u4e86 <code>rdi<\/code> \u8ddf <code>esi<\/code> \u5bc4\u5b58\u5668\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"783\" height=\"375\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-8-3.png\" alt=\"\" class=\"wp-image-1233\"\/><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >\/*\n* Restore registers.\n*\/\nmovq (JB_RBX*8)(%rdi), %rbx\nmovq (JB_RBP*8)(%rdi), %rbp\nmovq (JB_R12*8)(%rdi), %r12\nmovq (JB_R13*8)(%rdi), %r13\nmovq (JB_R14*8)(%rdi), %r14\nmovq (JB_R15*8)(%rdi), %r15<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u8fd9\u6bb5\u4ee3\u7801 \u662f\u6062\u590d\u4e4b\u524d\u7684\u5bc4\u5b58\u5668\u7684\u503c\uff0c\u6bd4\u8f83\u7b80\u5355\uff0c\u8df3\u8fc7\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >\/* Set return value *\/\ntest %esi, %esi<\/code><\/pre>\n\n\n\n<p>test \u6307\u4ee4\u4f1a\u8bbe\u7f6e <strong>\u6807\u5fd7\u4f4d<\/strong>\uff0c\u6807\u5fd7\u4f4d\u7684\u77e5\u8bc6\u8bf7\u770b \u300a<a href=\"https:\/\/www.xianwaizhiyin.net\/?p=1219\">X86\u6c47\u7f16\u5165\u95e8-\u6807\u5fd7\u4f4d<\/a>\u300b\u3002<\/p>\n\n\n\n<p>\u8bf4\u4e2a\u6280\u5de7\uff0c\u53ef\u4ee5\u628a\u76f8\u5173\u7684\u5b8f\u5c55\u5f00\uff0c\u518d\u7528 gdb \u5bf9\u6587\u4ef6\u884c\u8fdb\u884c\u65ad\u70b9\u5c31\u6bd4\u8f83\u65b9\u4fbf\u3002\u7ecf\u8fc7 GDB \u8c03\u8bd5\u5f97\u77e5\uff0c\u4e0a\u9762\u7684 <code class=\"prettyprint\" >test<\/code> \u6307\u4ee4\u6267\u884c\u4e4b\u540e\uff0c\u628a PF \u4f4d\u7f6e\u4e3a 0\u4e86\u3002\u5177\u4f53\u6211\u5c31\u4e0d\u8d34\u56fe\u7247\u4e86\u3002\u7ee7\u7eed\u8fd0\u884c\u4e0b\u9762\u4ee3\u7801\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >mov $01, %eax\ncmove %eax, %esi\nmov %esi, %eax\nmovq (JB_PC*8)(%rdi), %rdx\nmovq (JB_RSP*8)(%rdi), %rsp\n\/* Jump to saved PC *\/\njmpq *%rdx<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u7684 cmove \u6307\u4ee4\u6bd4\u8f83\u964c\u751f\uff0cc \u4ee3\u8868 condition\uff08\u6761\u4ef6\uff09\uff0c\u53ea\u6709\u6ee1\u8db3\u67d0\u4e2a\u6761\u4ef6\u624d\u4f1a \u6267\u884c <code class=\"prettyprint\" >mov<\/code> \u64cd\u4f5c\u3002\u6240\u4ee5\uff0c\u8fd9\u53e5\u4ee3\u7801 <code>cmove %eax, %esi<\/code> \u7684\u610f\u601d\u662f\uff0c\u5982\u679c ZF \u4f4d\u7f6e1\uff0c\u5c31\u628a eax \u7684\u503c\u8d4b\u503c\u7ed9 esi\u3002\u63a8\u8350\u9605\u8bfb<a href=\"https:\/\/www.cnblogs.com\/kenzhang1031\/p\/3428623.html#s4_2\">\u300acmov \u6307\u4ee4\u300b<\/a><\/p>\n\n\n\n<p>\u73b0\u5728 \u5bf9\u6bd4 <code class=\"prettyprint\" >_st_md_cxt_save()<\/code> \u4e0e <code>_st_md_cxt_restore()<\/code> \u51fd\u6570\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1093\" height=\"592\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-8-4.png\" alt=\"\" class=\"wp-image-1234\"\/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u770b\uff0c\u4ee3\u7801\u903b\u8f91\u5e76\u6ca1\u6709\u592a\u591a\u7279\u522b\u7684\u5730\u65b9\uff0c<strong>\u91cd\u70b9 \u5c31\u662f\u90a3\u4e2a<\/strong> <code class=\"prettyprint\" >jmpq *%rdx<\/code> \u3002<code>jmp<\/code> \u53ef\u4ee5\u63a7\u5236\u6307\u4ee4\u8df3\u8f6c\u3002\u8df3\u5230\u534f\u7a0b\u7684\u6267\u884c\u8def\u5f84\u3002\u8fd9\u91cc\u5c31\u8981\u4ed4\u7ec6\u7814\u7a76\u4e00\u4e0b <code>(JB_PC*8)(%rdi)<\/code> \u4fdd\u5b58\u7684\u662f\u4ec0\u4e48\uff0c\u57fa\u4e8e\u4e4b\u524d\u7684\u6587\u7ae0\uff0c\u8fd9\u91cc\u4fdd\u5b58\u7684\u4e1c\u897f\u662f <code>_ST_INIT_CONTEXT()<\/code> \u51fd\u6570\u5904\u7406\u7684\u3002<\/p>\n\n\n\n<p><code class=\"prettyprint\" >(JB_PC*8)(%rdi)<\/code> \u6307\u5411\u7684\u5730\u5740\uff0c\u5c31\u662f\u4e4b\u524d\u7684 <code>st_thread_create()<\/code> \u7684 <code>if<\/code> \u5224\u65ad\uff0c\u6211\u628a\u5b8f\u5c55\u5f00\u4e86\uff0c\u65b9\u4fbf\u67e5\u770b\u3002\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"623\" height=\"297\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-8-5.png\" alt=\"\" class=\"wp-image-1235\"\/><\/figure>\n\n\n\n<p>\u4e4b\u524d\u4e00\u76f4\u4e0d\u77e5\u9053\u4ec0\u4e48\u60c5\u51b5\u4f1a\u8df3\u8fdb\u53bb\u8fd9\u4e2a <code class=\"prettyprint\" >if<\/code> \uff0c\u539f\u6765\u5c31\u662f<strong>\u6b64\u65f6\u6b64\u523b<\/strong>\u8df3\u8fdb\u53bb\u3002\u56e0\u4e3a <code>_st_md_cxt_restore()<\/code> \u91cc\u9762\u6267\u884c\u4e86 <code>mov $01, %eax<\/code>\uff0c\u6240\u4ee5\u8fd9\u4e2a\u6761\u4ef6\u53ef\u4ee5\u8df3\u8fdb\u53bb\u4e86\u3002\u8fd9\u65f6\u5019\u5c31\u5f00\u59cb\u6267\u884c <code>_st_thread_main()<\/code> \u51fd\u6570\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"645\" height=\"385\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-8-6.png\" alt=\"\" class=\"wp-image-1236\"\/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c_st_thread_main() \u4f1a\u6267\u884c\u534f\u7a0b\u7684 start \u6307\u9488\u51fd\u6570 \uff08do_resolve\uff09\uff0c\u7136\u540e\u518d\u9012\u5f52 \u8c03 <code class=\"prettyprint\" >st_thread_exit()<\/code>\u3002<\/p>\n\n\n\n<p>\u81f3\u6b64 \u5206\u6790\u5b8c\u6bd5\uff0c<code class=\"prettyprint\" >st_thread_exit<\/code> \u7684\u6d41\u7a0b\u56fe\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1515\" height=\"934\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-8-9.png\" alt=\"\" class=\"wp-image-1230\"\/><\/figure>\n\n\n\n<p>\u4e0b\u7bc7\u6587\u7ae0\u5f00\u59cb\u8bb2\u89e3\uff0c_st_thread_main() \u534f\u7a0b\u7684 start \u6307\u9488\u51fd\u6570 \uff08do_resolve\uff09\uff0c\u4ee5\u53ca\u4e3a\u4ec0\u4e48 <code class=\"prettyprint\" >st_recvfrom()<\/code> \u4e0d\u4f1a\u963b\u585e\u5176\u4ed6\u7684\u534f\u7a0b\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u76f8\u5173\u9605\u8bfb\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u300a<a href=\"https:\/\/www.xianwaizhiyin.net\/?p=1219\">X86\u6c47\u7f16\u5165\u95e8-\u6807\u5fd7\u4f4d<\/a>\u300b<\/li><li><a href=\"https:\/\/www.cnblogs.com\/kenzhang1031\/p\/3428623.html#s4_2\">\u300acmov \u6307\u4ee4\u300b<\/a><\/li><\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u7531\u4e8e\u7b14\u8005\u7684\u6c34\u5e73\u6709\u9650\uff0c 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