| Demonstrations of uthreads. |
| |
| |
| uthreads traces thread creation events in Java or raw (C) pthreads, and prints |
| details about the newly created thread. For Java threads, the thread name is |
| printed; for pthreads, the thread's start function is printed, if there is |
| symbol information to resolve it. |
| |
| For example, trace all Java thread creation events: |
| |
| # ./uthreads -l java 27420 |
| Tracing thread events in process 27420 (language: java)... Ctrl-C to quit. |
| TIME ID TYPE DESCRIPTION |
| 18.596 R=9/N=0 start SIGINT handler |
| 18.596 R=4/N=0 stop Signal Dispatcher |
| ^C |
| |
| The ID column in the preceding output shows the thread's runtime ID and native |
| ID, when available. The accuracy of this information depends on the Java |
| runtime. |
| |
| |
| Next, trace only pthread creation events in some native application: |
| |
| # ./uthreads 27450 |
| Tracing thread events in process 27450 (language: c)... Ctrl-C to quit. |
| TIME ID TYPE DESCRIPTION |
| 0.924 27462 pthread primes_thread [primes] |
| 0.927 27463 pthread primes_thread [primes] |
| 0.928 27464 pthread primes_thread [primes] |
| 0.928 27465 pthread primes_thread [primes] |
| ^C |
| |
| The thread name ("primes_thread" in this example) is resolved from debuginfo. |
| If symbol information is not present, the thread's start address is printed |
| instead. |
| |
| |
| USAGE message: |
| |
| # ./uthreads -h |
| usage: uthreads.py [-h] [-l {c,java,none}] [-v] pid |
| |
| Trace thread creation/destruction events in high-level languages. |
| |
| positional arguments: |
| pid process id to attach to |
| |
| optional arguments: |
| -h, --help show this help message and exit |
| -l {c,java,none}, --language {c,java,none} |
| language to trace (none for pthreads only) |
| -v, --verbose verbose mode: print the BPF program (for debugging |
| purposes) |
| |
| examples: |
| ./uthreads -l java 185 # trace Java threads in process 185 |
| ./uthreads -l none 12245 # trace only pthreads in process 12245 |
