diff options
Diffstat (limited to 'MdePkg/Library/BasePerformanceLibNull/PerformanceLib.c')
| -rw-r--r-- | MdePkg/Library/BasePerformanceLibNull/PerformanceLib.c | 56 |
1 files changed, 34 insertions, 22 deletions
diff --git a/MdePkg/Library/BasePerformanceLibNull/PerformanceLib.c b/MdePkg/Library/BasePerformanceLibNull/PerformanceLib.c index 01226cbb02..ec88d848ae 100644 --- a/MdePkg/Library/BasePerformanceLibNull/PerformanceLib.c +++ b/MdePkg/Library/BasePerformanceLibNull/PerformanceLib.c @@ -82,34 +82,46 @@ EndPerformanceMeasurement ( }
/**
- Retrieves a previously logged performance measurement.
+ Attempts to retrieve a performance measurement log entry from the performance measurement log.
- Retrieves the performance log entry from the performance log
- that immediately follows the log entry specified by LogEntryKey.
- If LogEntryKey is zero, then the first entry from the performance log is returned.
- If the log entry specified by LogEntryKey is the last entry in the performance log,
- then 0 is returned. Otherwise, the performance log entry is returned in Handle,
- Token, Module, StartTimeStamp, and EndTimeStamp.
- The key for the current performance log entry is returned.
-
- @param LogEntryKey The key for the previous performance measurement log entry.
- If 0, then the first performance measurement log entry is retrieved.
- @param Handle Pointer to environment specific context used
- to identify the component being measured.
- @param Token Pointer to a Null-terminated ASCII string
- that identifies the component being measured.
- @param Module Pointer to a Null-terminated ASCII string
- that identifies the module being measured.
- @param StartTimeStamp The 64-bit time stamp that was recorded when the measurement was started.
- @param EndTimeStamp The 64-bit time stamp that was recorded when the measurement was ended.
-
- @return The key for the current performance log entry.
+ Attempts to retrieve the performance log entry specified by LogEntryKey. If LogEntryKey is
+ zero on entry, then an attempt is made to retrieve the first entry from the performance log,
+ and the key for the second entry in the log is returned. If the performance log is empty,
+ then no entry is retrieved and zero is returned. If LogEntryKey is not zero, then the performance
+ log entry associated with LogEntryKey is retrieved, and the key for the next entry in the log is
+ returned. If LogEntryKey is the key for the last entry in the log, then the last log entry is
+ retrieved and an implementation specific non-zero key value that specifies the end of the performance
+ log is returned. If LogEntryKey is equal this implementation specific non-zero key value, then no entry
+ is retrieved and zero is returned. In the cases where a performance log entry can be returned,
+ the log entry is returned in Handle, Token, Module, StartTimeStamp, and EndTimeStamp.
+ If LogEntryKey is not a valid log entry key for the performance measurement log, then ASSERT().
+ If Handle is NULL, then ASSERT().
+ If Token is NULL, then ASSERT().
+ If Module is NULL, then ASSERT().
+ If StartTimeStamp is NULL, then ASSERT().
+ If EndTimeStamp is NULL, then ASSERT().
+
+ @param LogEntryKey On entry, the key of the performance measurement log entry to retrieve.
+ 0, then the first performance measurement log entry is retrieved.
+ On exit, the key of the next performance lof entry entry.
+ @param Handle Pointer to environment specific context used to identify the component
+ being measured.
+ @param Token Pointer to a Null-terminated ASCII string that identifies the component
+ being measured.
+ @param Module Pointer to a Null-terminated ASCII string that identifies the module
+ being measured.
+ @param StartTimeStamp Pointer to the 64-bit time stamp that was recorded when the measurement
+ was started.
+ @param EndTimeStamp Pointer to the 64-bit time stamp that was recorded when the measurement
+ was ended.
+
+ @return The key for the next performance log entry (in general case).
**/
UINTN
EFIAPI
GetPerformanceMeasurement (
- UINTN LogEntryKey,
+ IN UINTN LogEntryKey,
OUT CONST VOID **Handle,
OUT CONST CHAR8 **Token,
OUT CONST CHAR8 **Module,
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