创建线程库

pthread.c

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+#include "pthread.h"
+
+
+/*
+*    pthread.c
+*
+*    POSIX threads library based on linux-0.11
+*
+*    Copyright (C) 2008  All rights reserved.
+*
+*    这个里面没有写多少注释，都是很简单的
+*/
+
+_syscall2(int, create_thread, unsigned long, start, void*, arg);
+_syscall2(int, syspthread_join, pthread_t, thread, void*, value_ptr);
+_syscall1(int, endthread, int, value);
+
+int pthread_attr_init(pthread_attr_t* attr) /*这个实验没有必要用到这个初始化函数*/
+{
+    ;;;;;
+    return 0;
+}
+int pthread_create(pthread_t* thread, const pthread_attr_t* attr, void* (*start)(void*), void* arg)
+{
+    int id = 0;
+    if (!thread) return EINVAL;
+
+    id = create_thread((unsigned long)start, (int*)arg);
+
+    /*printf("here after create_thread!\n");*/
+    /*stop: goto stop;*/
+    if (id < 0) return errno;
+    *thread = id;
+    return id;
+}
+
+void pthread_exit(void* value_ptr)
+{
+    endthread((int)value_ptr);
+}
+int pthread_join(pthread_t thread, void** value_ptr)
+{
+    syspthread_join(thread, value_ptr);
+    return 0;
+}
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