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89 lines
2.9 KiB
Plaintext
89 lines
2.9 KiB
Plaintext
# Copyright (C) 2009-2020 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Test that a resume cancels a previously unfinished or unreported
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# single-step correctly.
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#
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# The test consists of several threads all running the same loop.
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# There is a breakpoint set in the loop, hence all threads may hit it.
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# The test then issues several "next" commands in a loop.
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#
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# scheduler-locking must be set to the default of "off".
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#
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# Here's what would happen in gdbserver:
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#
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# 1) We issue a "continue", and wait until a thread hits the
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# breakpoint. Could be any thread, but assume thread 1 hits it.
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#
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# 2) We issue a "next" --- this single-steps thread 1, and resumes all
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# other threads.
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#
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# 3) thread 2, due to scheduler-locking off, hits the breakpoint.
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# gdbserver stops all other threads by sending them SIGSTOPs.
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#
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# 4) While being stopped in step 3, thread 1 reports a SIGTRAP, that
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# corresponds to the finished single-step of step 2. gdbserver
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# leaves the SIGTRAP pending to report later.
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#
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# 5) We issue another "next" --- this requests thread 2 to
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# single-step, and all other threads to continue, including thread
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# 1. Before resuming any thread, gdbserver notices that it
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# remembers from step 4 a pending SIGTRAP to report for thread 1,
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# so reports it now.
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#
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# 6) From GDB's perpective, this SIGTRAP can't represent a finished
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# single-step, since thread 1 was not single-stepping (it was
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# continued in step 5). Neither does this SIGTRAP correspond to a
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# breakpoint hit. GDB reports to the user a spurious SIGTRAP.
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standard_testfile
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if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable debug] != "" } {
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return -1
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}
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clean_restart ${binfile}
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if ![runto_main] then {
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fail "can't run to main"
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return 0
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}
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gdb_breakpoint [gdb_get_line_number "insert breakpoint here"]
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gdb_continue_to_breakpoint "continue to first breakpoint hit"
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set test "next in multiple threads with breakpoints"
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set iterations 20
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set ok 0
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for {set i 0} {$i < $iterations} {incr i} {
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set ok 0
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gdb_test_multiple "next" "$test" {
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-re " received signal SIGTRAP.*$gdb_prompt $" {
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fail "$test (spurious SIGTRAP)"
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}
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-re "$gdb_prompt $" {
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set ok 1
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}
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}
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if { $ok == 0 } {
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break
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}
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}
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if { $ok } {
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pass "$test"
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}
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