RFR: 8252324: Signal related code should be shared among POSIX platforms

[Gerard Ziemski]

hi all,

Please review this change that refactors common POSIX code into a separate
file.

Currently there appears to be quite a bit of duplicated code among POSIX
platforms, which makes it difficult to apply single fix to the signal code.
With this fix, we will only need to touch single file for common POSIX
code fixes from now on.

----------------------------------------------------------------------------
The APIs which moved from os/bsd/os_bsd.cpp to to os/posix/PosixSignals.cpp:

////////////////////////////////////////////////////////////////////////////////
// signal support
void os::Bsd::signal_sets_init()
sigset_t* os::Bsd::unblocked_signals()
sigset_t* os::Bsd::vm_signals()
void os::Bsd::hotspot_sigmask(Thread* thread)
////////////////////////////////////////////////////////////////////////////////
// sun.misc.Signal support
static void UserHandler(int sig, void *siginfo, void *context)
void* os::user_handler()
void* os::signal(int signal_number, void* handler)
void os::signal_raise(int signal_number)
int os::sigexitnum_pd()
static void jdk_misc_signal_init()
void os::signal_notify(int sig)
static int check_pending_signals()
int os::signal_wait()
////////////////////////////////////////////////////////////////////////////////
// suspend/resume support
static void resume_clear_context(OSThread *osthread)
static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context)
static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context)
static int SR_initialize()
static int sr_notify(OSThread* osthread)
static bool do_suspend(OSThread* osthread)
static void do_resume(OSThread* osthread)
///////////////////////////////////////////////////////////////////////////////////
// signal handling (except suspend/resume)
static void signalHandler(int sig, siginfo_t* info, void* uc)
struct sigaction* os::Bsd::get_chained_signal_action(int sig)
static bool call_chained_handler(struct sigaction *actp, int sig,
                                 siginfo_t *siginfo, void *context)
bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context)
int os::Bsd::get_our_sigflags(int sig)
void os::Bsd::set_our_sigflags(int sig, int flags)
void os::Bsd::set_signal_handler(int sig, bool set_installed)
void os::Bsd::install_signal_handlers()
static const char* get_signal_handler_name(address handler,
                                           char* buf, int buflen)
static void print_signal_handler(outputStream* st, int sig,
                                 char* buf, size_t buflen)
void os::run_periodic_checks()
void os::Bsd::check_signal_handler(int sig)

-----------------------------------------------------------------------------
The APIs which moved from os/posix/os_posix.cpp to os/posix/PosixSignals.cpp:

const char* os::Posix::get_signal_name(int sig, char* out, size_t outlen)
int os::Posix::get_signal_number(const char* signal_name)
int os::get_signal_number(const char* signal_name)
bool os::Posix::is_valid_signal(int sig)
bool os::Posix::is_sig_ignored(int sig)
const char* os::exception_name(int sig, char* buf, size_t size)
const char* os::Posix::describe_signal_set_short(const sigset_t* set, char* buffer, size_t buf_size)
void os::Posix::print_signal_set_short(outputStream* st, const sigset_t* set)
const char* os::Posix::describe_sa_flags(int flags, char* buffer, size_t size)
oid os::Posix::print_sa_flags(outputStream* st, int flags)
static bool get_signal_code_description(const siginfo_t* si, enum_sigcode_desc_t* out)
void os::print_siginfo(outputStream* os, const void* si0)
bool os::signal_thread(Thread* thread, int sig, const char* reason)
int os::Posix::unblock_thread_signal_mask(const sigset_t *set)
address os::Posix::ucontext_get_pc(const ucontext_t* ctx)
void os::Posix::ucontext_set_pc(ucontext_t* ctx, address pc)
struct sigaction* os::Posix::get_preinstalled_handler(int sig)
void os::Posix::save_preinstalled_handler(int sig, struct sigaction& oldAct)


--------------------------------------------------------
--------------------------------------------------------

DETAILS:

--------------------------------------------------------
Public APIs which are now internal static PosixSignals::

sigset_t* os::Bsd::vm_signals()
struct sigaction* os::Bsd::get_chained_signal_action(int sig)
int os::Bsd::get_our_sigflags(int sig)
void os::Bsd::set_our_sigflags(int sig, int flags)
void os::Bsd::set_signal_handler(int sig, bool set_installed)
void os::Bsd::check_signal_handler(int sig)
const char* os::Posix::get_signal_name(int sig, char* out, size_t outlen)
bool os::Posix::is_valid_signal(int sig)
const char* os::Posix::describe_signal_set_short(const sigset_t* set, char* buffer, size_t buf_size)
void os::Posix::print_signal_set_short(outputStream* st, const sigset_t* set)
const char* os::Posix::describe_sa_flags(int flags, char* buffer, size_t size)
oid os::Posix::print_sa_flags(outputStream* st, int flags)
static bool get_signal_code_description(const siginfo_t* si, enum_sigcode_desc_t* out)
void os::Posix::save_preinstalled_handler(int sig, struct sigaction& oldAct)

------------------------------------------------
Public APIs which moved to public PosixSignals::

void os::Bsd::signal_sets_init()
void os::Bsd::hotspot_sigmask(Thread* thread)
bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context)
void os::Bsd::install_signal_handlers()
bool os::Posix::is_sig_ignored(int sig)
int os::Posix::unblock_thread_signal_mask(const sigset_t *set)
address os::Posix::ucontext_get_pc(const ucontext_t* ctx)
void os::Posix::ucontext_set_pc(ucontext_t* ctx, address pc)

----------------------------------------------------
Internal APIs which are now public in PosixSignals::

static void jdk_misc_signal_init()
static int SR_initialize()
static bool do_suspend(OSThread* osthread)
static void do_resume(OSThread* osthread)
static void print_signal_handler(outputStream* st, int sig, char* buf, size_t buflen)

--------------------------
New APIs in PosixSignals::

static bool are_signal_handlers_installed();

-------------

Commit messages:
 - removed white spaces
 - Refactored common POSIX signal code into seperate file

Changes: https://git.openjdk.java.net/jdk/pull/157/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=157&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252324
  Stats: 5247 lines in 21 files changed: 1740 ins; 3400 del; 107 mod
  Patch: https://git.openjdk.java.net/jdk/pull/157.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/157/head:pull/157

PR: https://git.openjdk.java.net/jdk/pull/157