diff options
Diffstat (limited to 'indra/llcommon')
| -rw-r--r-- | indra/llcommon/lluuid.cpp | 37 | ||||
| -rw-r--r-- | indra/llcommon/lluuid.h | 3 |
2 files changed, 31 insertions, 9 deletions
diff --git a/indra/llcommon/lluuid.cpp b/indra/llcommon/lluuid.cpp index db8c9c85ab..0aaa50d231 100644 --- a/indra/llcommon/lluuid.cpp +++ b/indra/llcommon/lluuid.cpp @@ -44,10 +44,16 @@ #include "llmd5.h" #include "llstring.h" #include "lltimer.h" +#include "llthread.h" const LLUUID LLUUID::null; const LLTransactionID LLTransactionID::tnull; +// static +LLMutex * LLUUID::mMutex = NULL; + + + /* NOT DONE YET!!! @@ -734,6 +740,7 @@ void LLUUID::getCurrentTime(uuid_time_t *timestamp) getSystemTime(&time_last); uuids_this_tick = uuids_per_tick; init = TRUE; + mMutex = new LLMutex(NULL); } uuid_time_t time_now = {0,0}; @@ -785,6 +792,7 @@ void LLUUID::generate() #endif if (!has_init) { + has_init = 1; if (getNodeID(node_id) <= 0) { get_random_bytes(node_id, 6); @@ -806,18 +814,24 @@ void LLUUID::generate() #else clock_seq = (U16)ll_rand(65536); #endif - has_init = 1; } // get current time getCurrentTime(×tamp); + U16 our_clock_seq = clock_seq; - // if clock went backward change clockseq - if (cmpTime(×tamp, &time_last) == -1) { + // if clock hasn't changed or went backward, change clockseq + if (cmpTime(×tamp, &time_last) != 1) + { + LLMutexLock lock(mMutex); clock_seq = (clock_seq + 1) & 0x3FFF; - if (clock_seq == 0) clock_seq++; + if (clock_seq == 0) + clock_seq++; + our_clock_seq = clock_seq; // Ensure we're using a different clock_seq value from previous time } + time_last = timestamp; + memcpy(mData+10, node_id, 6); /* Flawfinder: ignore */ U32 tmp; tmp = timestamp.low; @@ -839,7 +853,8 @@ void LLUUID::generate() tmp >>= 8; mData[6] = (unsigned char) tmp; - tmp = clock_seq; + tmp = our_clock_seq; + mData[9] = (unsigned char) tmp; tmp >>= 8; mData[8] = (unsigned char) tmp; @@ -849,8 +864,6 @@ void LLUUID::generate() md5_uuid.update(mData,16); md5_uuid.finalize(); md5_uuid.raw_digest(mData); - - time_last = timestamp; } void LLUUID::generate(const std::string& hash_string) @@ -864,8 +877,14 @@ U32 LLUUID::getRandomSeed() static unsigned char seed[16]; /* Flawfinder: ignore */ getNodeID(&seed[0]); - seed[6]='\0'; - seed[7]='\0'; + + // Incorporate the pid into the seed to prevent + // processes that start on the same host at the same + // time from generating the same seed. + pid_t pid = LLApp::getPid(); + + seed[6]=(unsigned char)(pid >> 8); + seed[7]=(unsigned char)(pid); getSystemTime((uuid_time_t *)(&seed[8])); LLMD5 md5_seed; diff --git a/indra/llcommon/lluuid.h b/indra/llcommon/lluuid.h index 0b9e7d0cd0..7889828c85 100644 --- a/indra/llcommon/lluuid.h +++ b/indra/llcommon/lluuid.h @@ -31,6 +31,8 @@ #include "stdtypes.h" #include "llpreprocessor.h" +class LLMutex; + const S32 UUID_BYTES = 16; const S32 UUID_WORDS = 4; const S32 UUID_STR_LENGTH = 37; // actually wrong, should be 36 and use size below @@ -118,6 +120,7 @@ public: static BOOL validate(const std::string& in_string); // Validate that the UUID string is legal. static const LLUUID null; + static LLMutex * mMutex; static U32 getRandomSeed(); static S32 getNodeID(unsigned char * node_id); |