From 5e7df752a66b2082d063d2c4a10bc7013d479f55 Mon Sep 17 00:00:00 2001 From: Nat Goodspeed Date: Fri, 6 Dec 2019 16:31:49 -0500 Subject: DRTVWR-494: Use std::thread::id for LLThread::currentID(). LLThread::currentID() used to return a U32, a distinct unsigned value incremented by explicitly constructing LLThread or by calling LLThread:: registerThreadID() early in a thread launched by other means. The latter imposed an unobvious requirement on new code based on std::thread. Using std::thread::id instead delegates to the compiler/library the problem of distinguishing threads launched by any means. Change lots of explicit U32 declarations. Introduce LLThread::id_t typedef to avoid having to run around fixing uses again if we later revisit this decision. LLMutex, which stores an LLThread::id_t, wants a distinguished value meaning NO_THREAD, and had an enum with that name. But as std::thread::id promises that the default-constructed value is distinct from every valid value, NO_THREAD becomes unnecessary and goes away. Because LLMutex now stores LLThread::id_t instead of U32, make llmutex.h #include "llthread.h" instead of the other way around. This makes LLMutex an incomplete type within llthread.h, so move LLThread::lockData() and unlockData() to the .cpp file. Similarly, remove llrefcount.h's #include "llmutex.h" to break circularity; instead forward-declare LLMutex. It turns out that a number of source files assumed that #include "llthread.h" would get the definition for LLMutex. Sprinkle #include "llmutex.h" as needed. In the SAFE_SSL code in llcorehttp/httpcommon.cpp, there's an ssl_thread_id() callback that returns an unsigned long to the SSL library. When LLThread:: currentID() was U32, we could simply return that. But std::thread::id is very deliberately opaque, and can't be reinterpret_cast to unsigned long. Fortunately it can be hashed because std::hash is specialized with that type. --- indra/llcorehttp/httpcommon.cpp | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'indra/llcorehttp/httpcommon.cpp') diff --git a/indra/llcorehttp/httpcommon.cpp b/indra/llcorehttp/httpcommon.cpp index 7c93c54cdf..e37a38b05f 100644 --- a/indra/llcorehttp/httpcommon.cpp +++ b/indra/llcorehttp/httpcommon.cpp @@ -40,6 +40,7 @@ #include #if SAFE_SSL #include +#include // std::hash #endif @@ -369,7 +370,8 @@ void ssl_locking_callback(int mode, int type, const char *file, int line) //static unsigned long ssl_thread_id(void) { - return LLThread::currentID(); + // std::thread::id is very deliberately opaque, but we can hash it + return std::hash()(LLThread::currentID()); } #endif -- cgit v1.2.3