[英]C++ Linux Error Loading Shared Library `undefined symbol: pthread_create`
I have created a library that compiles well and everything. 我创建了一个可以很好地编译所有内容的库。 The library file is "libTextSearch.so"
库文件是“ libTextSearch.so”
Inside the library, it creates a thread
. 在库内部,它创建一个
thread
。 I am using C++11 threads for this: 我为此使用C ++ 11线程:
TextSearch::TextSearch(){
std::thread t(&TextSearch::ThreadProc, this);
t.detach();
}
As I said, the library compiles and I have the libTextSearch.so
file. 如我所说,库已编译,并且我有
libTextSearch.so
文件。
I am trying to load the library in a different application: 我正在尝试在其他应用程序中加载库:
void* handle = dlopen("libTextSearch.so", RTLD_LAZY);
if(!handle){
//std::cout << "\n Failed to load libTextSearch.so\n\n";
fprintf(stderr, "dlopen failed: %s\n", dlerror());
return 1;
}
I have the package copied to /usr/lib
already. 我已经将软件包复制到
/usr/lib
。 This is the output I get: 这是我得到的输出:
dlopen failed: /usr/lib/libTextSearch.so: undefined symbol: pthread_create
RUN FINISHED; exit value 1; real time: 0ms; user: 0ms; system: 0ms
I have looked up this question . 我查了这个问题 。 I think it is related, but I have no idea of applying that to my situation.
我认为这是相关的,但我不知道将其应用于我的情况。
Any ideas? 有任何想法吗?
I can't exactly be sure since I don't know how you are building this project, or how libTextSearch.so is built, but you need to link against libpthread somehow when generating libTextSearch. 我不确定,因为我不知道您如何构建此项目,也不知道libTextSearch.so的构建方式,但是在生成libTextSearch时,您需要以某种方式链接到libpthread。 Typically in your build environment you would supply -lpthread as an argument to dynamically link to it.
通常,在您的构建环境中,您将提供-lpthread作为参数以动态链接到它。
gcc -c testsearch.cpp -lpthread -o textsearch.o
for example 例如
Just dlopen
thread
library beforehand with RTLD_GLOBAL
只需使用
RTLD_GLOBAL
预先dlopen
thread
库
void* handlePthread = dlopen("libpthread.so.0", RTLD_GLOBAL | RTLD_LAZY);
if(!handlePthread ){
//std::cout << "\n Failed to load libpthread.so.0\n\n";
fprintf(stderr, "dlopen failed: %s\n", dlerror());
return 1;
}
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