John Baldwin 6e9567fe2a Add support for LWP-based threads on FreeBSD. ... Older versions of FreeBSD supported userland threading via a pure user-space threading library (N threads scheduled on 1 process) and a N:M model (N threads scheduled on M LWPs). However, modern FreeBSD versions only support a M:M threading model where each user thread is backed by a dedicated LWP. This thread target only supports this threading model. It also uses ptrace to query and alter LWP state directly rather than using libthread_db to simplify the implementation. FreeBSD recently gained support for reporting LWP events (birth and death of LWPs). GDB will use LWP events when present. For older systems it fetches the list of LWPs in the to_update_thread_list target op to update the list of threads on each stop. This target supports scheduler locking by using ptrace to suspend individual LWPs as necessary before resuming a process. gdb/ChangeLog: * configure.ac: Check for support for LWP names on FreeBSD. * fbsd-nat.c [PT_LWPINFO] New variable debug_fbsd_lwp. [TDP_RFPPWAIT || HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME] (fbsd_fetch_kinfo_proc): Move function earlier. [PT_LWPINFO] (fbsd_thread_alive): New function. [PT_LWPINFO] (fbsd_pid_to_str): New function. [HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME] (fbsd_thread_name): New function. [PT_LWP_EVENTS] (fbsd_enable_lwp_events): New function. [PT_LWPINFO] (fbsd_add_threads): New function. [PT_LWPINFO] (fbsd_update_thread_list): New function. [PT_LWPINFO] New variable super_resume. [PT_LWPINFO] (resume_one_thread_cb): New function. [PT_LWPINFO] (resume_all_threads_cb): New function. [PT_LWPINFO] (fbsd_resume): New function. (fbsd_remember_child): Save full ptid instead of plain pid. (fbsd_is_child_pending): Return ptid of saved child process. (fbsd_wait): Include lwp in returned ptid and switch to LWP ptid on first stop. [PT_LWP_EVENTS] Handle LWP events. [TDP_RFPPWAIT] Include LWP in child ptid. (fbsd_post_startup_inferior) [PT_LWP_EVENTS]: Enable LWP events. (fbsd_post_attach) [PT_LWP_EVENTS]: Enable LWP events. Add threads for existing processes. (fbsd_nat_add_target) [PT_LWPINFO]: Set "to_thread_alive" to "fbsd_thread_alive". Set "to_pid_to_str" to "fbsd_pid_to_str". [HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME]: Set "to_thread_name" to "fbsd_thread_name". [PT_LWPINFO]: Set "to_update_thread_list" to "fbsd_update_thread_list". Set "to_has_thread_control" to "tc_schedlock". Set "to_resume" to "fbsd_resume". (_initialize_fbsd_nat): New function. * configure: Regenerate. * config.in: Regenerate. gdb/doc/ChangeLog: * gdb.texinfo (Debugging Output): Document "set/show debug fbsd-lwp".		2016-01-19 08:19:00 -08:00
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a4rc.sed
agentexpr.texi	GDB copyright headers update after running GDB's copyright.py script.	2016-01-01 08:43:22 +04:00
all-cfg.texi	GDB copyright headers update after running GDB's copyright.py script.	2016-01-01 08:43:22 +04:00
annotate.texinfo	GDB copyright headers update after running GDB's copyright.py script.	2016-01-01 08:43:22 +04:00
ChangeLog	Add support for LWP-based threads on FreeBSD.	2016-01-19 08:19:00 -08:00
doxy-index.in	GDB copyright headers update after running GDB's copyright.py script.	2016-01-01 08:43:22 +04:00
Doxyfile-base.in	GDB copyright headers update after running GDB's copyright.py script.	2016-01-01 08:43:22 +04:00
Doxyfile-gdb-api.in	GDB copyright headers update after running GDB's copyright.py script.	2016-01-01 08:43:22 +04:00
Doxyfile-gdb-xref.in	GDB copyright headers update after running GDB's copyright.py script.	2016-01-01 08:43:22 +04:00
Doxyfile-gdbserver.in	GDB copyright headers update after running GDB's copyright.py script.	2016-01-01 08:43:22 +04:00
fdl.texi
filter-for-doxygen	Add Doxygen support to GDB	2014-02-10 19:10:34 -08:00
filter-params.pl	Add Doxygen support to GDB	2014-02-10 19:10:34 -08:00
gdb.texinfo	Add support for LWP-based threads on FreeBSD.	2016-01-19 08:19:00 -08:00
gpl.texi
guile.texi	Per-inferior/Inferior-qualified thread IDs	2016-01-13 10:59:43 +00:00
lpsrc.sed
Makefile.in	GDB copyright headers update after running GDB's copyright.py script.	2016-01-01 08:43:22 +04:00
observer.texi	GDB copyright headers update after running GDB's copyright.py script.	2016-01-01 08:43:22 +04:00
psrc.sed
python.texi	Add Python InferiorThread.global_num attribute	2016-01-13 11:00:54 +00:00
refcard.tex	GDB copyright headers update after running GDB's copyright.py script.	2016-01-01 08:43:22 +04:00
stabs.texinfo	GDB copyright headers update after running GDB's copyright.py script.	2016-01-01 08:43:22 +04:00
stack_frame.eps
stack_frame.pdf
stack_frame.png
stack_frame.svg
stack_frame.txt