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# Copyright (C) 2009, 2010 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see .

# Test that a resume cancels a previously unfinished or unreported

# single-step correctly.

#

# The test consists of several threads all running the same loop.

# There is a breakpoint set in the loop, hence all threads may hit it.

# The test then issues several "next" commands in a loop.

#

# scheduler-locking must be set to the default of "off".

#

# Here's what would happen in gdbserver:

#

# 1) We issue a "continue", and wait until a thread hits the

#    breakpoint.  Could be any thread, but assume thread 1 hits it.

#

# 2) We issue a "next" --- this single-steps thread 1, and resumes all

#    other threads.

#

# 3) thread 2, due to scheduler-locking off, hits the breakpoint.

#    gdbserver stops all other threads by sending them SIGSTOPs.

#

# 4) While being stopped in step 3, thread 1 reports a SIGTRAP, that

#    corresponds to the finished single-step of step 2.  gdbserver

#    leaves the SIGTRAP pending to report later.

#

# 5) We issue another "next" --- this requests thread 2 to

#    single-step, and all other threads to continue, including thread

#    1.  Before resuming any thread, gdbserver notices that it

#    remembers from step 4 a pending SIGTRAP to report for thread 1,

#    so reports it now.

#

# 6) From GDB's perpective, this SIGTRAP can't represent a finished

#    single-step, since thread 1 was not single-stepping (it was

#    continued in step 5).  Neither does this SIGTRAP correspond to a

#    breakpoint hit.  GDB reports to the user a spurious SIGTRAP.

set testfile "pending-step"

set srcfile ${testfile}.c

set binfile ${objdir}/${subdir}/${testfile}

if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug "incdir=${objdir}"]] != "" } {

    return -1

}

# Start with a fresh gdb.

gdb_exit

gdb_start

gdb_reinitialize_dir $srcdir/$subdir

gdb_load ${binfile}

if ![runto_main] then {

    fail "Can't run to main"

    return 0

}

gdb_breakpoint [gdb_get_line_number "insert breakpoint here"]

gdb_continue_to_breakpoint "continue to first breakpoint hit"

set test "next in multiple threads with breakpoints"

set iterations 20

set ok 0

for {set i 0} {$i < $iterations} {incr i} {

    set ok 0

    gdb_test_multiple "next" "$test" {

        -re "SIGTRAP.*$gdb_prompt $" {

            fail "$test (spurious SIGTRAP)"

        }

        -re "$gdb_prompt $" {

            set ok 1

        }

    }

    if { $ok == 0 } {

        break

    }

}

if { $ok  } {

    pass "$test"

}