1 Demonstrations of uthreads. 2 3 4 uthreads traces thread creation events in Java or raw (C) pthreads, and prints 5 details about the newly created thread. For Java threads, the thread name is 6 printed; for pthreads, the thread's start function is printed, if there is 7 symbol information to resolve it. 8 9 For example, trace all Java thread creation events: 10 11 # ./uthreads -l java 27420 12 Tracing thread events in process 27420 (language: java)... Ctrl-C to quit. 13 TIME ID TYPE DESCRIPTION 14 18.596 R=9/N=0 start SIGINT handler 15 18.596 R=4/N=0 stop Signal Dispatcher 16 ^C 17 18 The ID column in the preceding output shows the thread's runtime ID and native 19 ID, when available. The accuracy of this information depends on the Java 20 runtime. 21 22 23 Next, trace only pthread creation events in some native application: 24 25 # ./uthreads 27450 26 Tracing thread events in process 27450 (language: c)... Ctrl-C to quit. 27 TIME ID TYPE DESCRIPTION 28 0.924 27462 pthread primes_thread [primes] 29 0.927 27463 pthread primes_thread [primes] 30 0.928 27464 pthread primes_thread [primes] 31 0.928 27465 pthread primes_thread [primes] 32 ^C 33 34 The thread name ("primes_thread" in this example) is resolved from debuginfo. 35 If symbol information is not present, the thread's start address is printed 36 instead. 37 38 39 USAGE message: 40 41 # ./uthreads -h 42 usage: uthreads.py [-h] [-l {c,java,none}] [-v] pid 43 44 Trace thread creation/destruction events in high-level languages. 45 46 positional arguments: 47 pid process id to attach to 48 49 optional arguments: 50 -h, --help show this help message and exit 51 -l {c,java,none}, --language {c,java,none} 52 language to trace (none for pthreads only) 53 -v, --verbose verbose mode: print the BPF program (for debugging 54 purposes) 55 56 examples: 57 ./uthreads -l java 185 # trace Java threads in process 185 58 ./uthreads -l none 12245 # trace only pthreads in process 12245 59
