How do I see all threads in GDB?
How do I see all threads in GDB?
Use the “info threads” command to see the IDs of currently known threads. The GDB thread debugging facility allows you to observe all threads while your program runs–but whenever GDB takes control, one thread in particular is always the focus of debugging. This thread is called the current thread.
How do I get thread info in Linux?
Each thread in a process creates a directory under /proc//task . Count the number of directories, and you have the number of threads. ps -eLf on the shell shall give you a list of all the threads and processes currently running on the system. Or, you can run top command then hit ‘H’ to toggle thread listings.
How do you check how many threads are there in Linux?
Method 1 – /proc This is the easiest way to see the thread count of any active process on a Linux machine. proc command exports text file of process and system hardware information, such as CPU, interrupts, memory, disk, etc. The above example is having one thread per process.
How do I show breakpoints in gdb?
You can see these breakpoints with the GDB maintenance command `maint info breakpoints’ . Using the same format as `info breakpoints’ , display both the breakpoints you’ve set explicitly, and those GDB is using for internal purposes. Internal breakpoints are shown with negative breakpoint numbers.
Does gdb stop all threads?
By default, GDB stops all threads when any breakpoint is hit, and resumes all threads when you issue any command (such as continue , next , step , finish , etc.) which requires that the inferior process (the one you are debugging) start to execute.
How do you view threads?
To view the threads in a process with Process Explorer, select a process and open the process properties (double-click on the process or click on the Process, Properties menu item). Then click on the Threads tab. This tab shows a list of the threads in the process and three columns of information.
How do I check how many threads I have?
Resolution
- Open Task Manager.
- Select Performance tab.
- Look for Cores and Logical Processors (Threads)
What are breakpoints in gdb?
Breakpoints are points in your code at which gdb will stop and allow executing other gdb commands. Set a breakpoint at the beginning of a function. Example. Set a breakpoint at the beginning of main .
How do I debug a multi-thread program in gdb?
GDB provides these facilities for debugging multi-thread programs: ‘ thread thread-id ’, a command to switch among threads ‘ info threads ’, a command to inquire about existing threads ‘ thread apply [thread-id-list | all] args ’, a command to apply a command to a list of threads
How do I get the current thread ID in gdb?
Make thread ID thread-id the current thread. The command argument thread-id is the GDB thread ID, as shown in the first field of the ‘ info threads ’ display, with or without an inferior qualifier (e.g., ‘ 2.1 ’ or ‘ 1 ’). GDB responds by displaying the system identifier of the thread you selected, and its current stack frame summary:
What does the asterisk * mean on the GDB thread number?
An asterisk ‘ * ’ to the left of the GDB thread number indicates the current thread. (gdb) info threads Id Target Id Frame * 1 process 35 thread 13 main (argc=1, argv=0x7ffffff8) 2 process 35 thread 23 0x34e5 in sigpause () 3 process 35 thread 27 0x34e5 in sigpause () at threadtest.c:68
How do I view threads of a process in Linux?
Use either the “-T” or “-L” option of ps to display the threads of a process. The command below displays the threads of the mysqld process. If you would like to view the thread id field, use the following syntax. Use the “-H” option of top to view threads. The command below will run top in batch mode and will exit after one iteration.
