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Curl: ��: SSL and multithread crash on windows, how to use mutex on windows?

SSL and multithread crash on windows, how to use mutex on windows?

From: mao mao
Date: Fri, 25 Nov 2016 09:50:48 +0000

Thankyou Thomas and Johan both


to Johan: how to use these two functions

openssl_crypto_locking_callback
openssl_crypto_init_locks
when start new thread using _beginthreadex or createthread or afxbeginthread?


Using boost:

#include
#include

#define OPENSSL_THREAD_DEFINES
#include
#if !defined(OPENSSL_THREADS)
#error OpenSSL needs to be compiled with thread support
#endif

boost::ptr_vector openssl_lock_list;

void openssl_crypto_locking_callback(
int mode, int type, const char * const, int
) {
if( mode & CRYPTO_LOCK ) {
openssl_lock_list[type].lock();
} else {
openssl_lock_list[type].unlock();
}
}

void openssl_crypto_init_locks()
{
for(int i = 0; i < CRYPTO_num_locks(); ++i) {
openssl_lock_list.push_back(new boost::mutex());
}

// Not neccessary according to docs, and boost can't really give a pointer or
// integer ID of a thread
// CRYPTO_THREADID_set_callback(openssl_crypto_threadid_callback);
CRYPTO_set_locking_callback(openssl_crypto_locking_callback);
}



Johan de Vries
Software Developer

[http://www.ixon.net/wp-content/uploads/2013/12/logo-default.png]



> SSL and multithread crash on windows, how to use mutex on windows?

Best way is you post a striped down example which crashes.

For me the following works, without a problem.

Once:
        curl_global_init(CURL_GLOBAL_DEFAULT);

For each thread:
        _beginthread(...);
        share = curl_share_init();
        curl_share_setopt(share, CURLSHOPT_SHARE, CURL_LOCK_DATA_SSL_SESSION);
        curl = curl_easy_init();
        curl_easy_setopt(curl, CURLOPT_SHARE, share);
        curl_easy_setopt(curl, CURLOPT_URL, "https://google.com");
        curl_easy_perform(curl);
        curl_easy_cleanup(curl);

Cheers,
        Thomas
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Received on 2016-11-25