Date: Thu, 29 May 2003 09:53:54 +0800 From: "David Xu" <davidxu@viatech.com.cn> To: "Craig Rodrigues" <rodrigc@attbi.com>, <freebsd-threads@freebsd.org> Subject: Re: Question about OpenSSL id_function() and pthreads Message-ID: <006b01c32585$28ca4ad0$f001a8c0@davidw2k> References: <20030528235120.GA3481@attbi.com>
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----- Original Message -----=20 From: "Craig Rodrigues" <rodrigc@attbi.com> To: <freebsd-threads@freebsd.org> Sent: Thursday, May 29, 2003 7:51 AM Subject: Question about OpenSSL id_function() and pthreads > Hi, >=20 > I previously asked this question on freebsd-security@ and > freebsd-current@ : >=20 > = http://docs.freebsd.org/cgi/getmsg.cgi?fetch=3D63674+0+archive/2003/freeb= sd-security/20030302.freebsd-security >=20 >=20 > Let me try again, now that there is a freebsd-threads mailing list. >=20 >=20 > On the following OpenSSL web page: > http://www.openssl.org/docs/crypto/threads.html >=20 > "void CRYPTO_set_id_callback(unsigned long (*id_function)(void)); >=20 > id_function(void) is a function that returns a thread ID.=20 > It is not needed on Windows nor on platforms where getpid() returns=20 > a different ID for each thread (most notably Linux)." >=20 >=20 > I have some third party C++ code which tries to implements this = function: >=20 > tatic unsigned long > idFunction() > { > #ifdef _WIN32 > return static_cast<unsigned long>(GetCurrentThreadId()); > #else > return static_cast<unsigned long>(pthread_self()); > #endif > } >=20 >=20 > This code does not compile on FreeBSD-CURRENT: >=20 > OpenSSLPluginI.cpp: In function `long unsigned int idFunction()': > OpenSSLPluginI.cpp:151: invalid static_cast from type `pthread*' to = type `long=20 > unsigned int' >=20 >=20 > How can I implement this function properly on FreeBSD? >=20 Why don't you change an abused static_cast to use C convertion directly like this: static unsigned long idFunction() { #ifdef _WIN32 return static_cast<unsigned long>(GetCurrentThreadId()); #else return (unsigned long)pthread_self(); #endif } Don't be confused by mincing C++. David Xu
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