/* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* ** nssilock.h - Instrumented locking functions for NSS ** ** Description: ** nssilock provides instrumentation for locks and monitors in ** the NSS libraries. The instrumentation, when enabled, causes ** each call to the instrumented function to record data about ** the call to an external file. The external file ** subsequently used to extract performance data and other ** statistical information about the operation of locks used in ** the nss library. ** ** To enable compilation with instrumentation, build NSS with ** the compile time switch NEED_NSS_ILOCK defined. ** ** say: "gmake OS_CFLAGS+=-DNEED_NSS_ILOCK" at make time. ** ** At runtime, to enable recording from nssilock, one or more ** environment variables must be set. For each nssILockType to ** be recorded, an environment variable of the form NSS_ILOCK_x ** must be set to 1. For example: ** ** set NSS_ILOCK_Cert=1 ** ** nssilock uses PRLOG is used to record to trace data. The ** PRLogModule name associated with nssilock data is: "nssilock". ** To enable recording of nssilock data you will need to set the ** environment variable NSPR_LOG_MODULES to enable ** recording for the nssilock log module. Similarly, you will ** need to set the environment variable NSPR_LOG_FILE to specify ** the filename to receive the recorded data. See prlog.h for usage. ** Example: ** ** export NSPR_LOG_MODULES=nssilock:6 ** export NSPR_LOG_FILE=xxxLogfile ** ** Operation: ** nssilock wraps calls to NSPR's PZLock and PZMonitor functions ** with similarly named functions: PZ_NewLock(), etc. When NSS is ** built with lock instrumentation enabled, the PZ* functions are ** compiled into NSS; when lock instrumentation is disabled, ** calls to PZ* functions are directly mapped to PR* functions ** and the instrumentation arguments to the PZ* functions are ** compiled away. ** ** ** File Format: ** The format of the external file is implementation ** dependent. Where NSPR's PR_LOG() function is used, the file ** contains data defined for PR_LOG() plus the data written by ** the wrapped function. On some platforms and under some ** circumstances, platform dependent logging or ** instrumentation probes may be used. In any case, the ** relevant data provided by the lock instrumentation is: ** ** lockType, func, address, duration, line, file [heldTime] ** ** where: ** ** lockType: a character representation of nssILockType for the ** call. e.g. ... "cert" ** ** func: the function doing the tracing. e.g. "NewLock" ** ** address: address of the instrumented lock or monitor ** ** duration: is how long was spent in the instrumented function, ** in PRIntervalTime "ticks". ** ** line: the line number within the calling function ** ** file: the file from which the call was made ** ** heldTime: how long the lock/monitor was held. field ** present only for PZ_Unlock() and PZ_ExitMonitor(). ** ** Design Notes: ** The design for lock instrumentation was influenced by the ** need to gather performance data on NSS 3.x. It is intended ** that the effort to modify NSS to use lock instrumentation ** be minimized. Existing calls to locking functions need only ** have their names changed to the instrumentation function ** names. ** ** Private NSS Interface: ** nssilock.h defines a private interface for use by NSS. ** nssilock.h is experimental in nature and is subject to ** change or revocation without notice. ... Don't mess with ** it. **
*/
/* ** Declare the trace record
*/ struct pzTrace_s {
PRUint32 threadID; /* PR_GetThreadID() */
nssILockOp op; /* operation being performed */
nssILockType ltype; /* lock type identifier */
PRIntervalTime callTime; /* time spent in function */
PRIntervalTime heldTime; /* lock held time, or -1 */ void *lock; /* address of lock structure */
PRIntn line; /* line number */ char file[24]; /* filename */
};
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