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srs/trunk/3rdparty/st-srs/Makefile
Jacob Su e7d78462fe
ST: Use clock_gettime to prevent time jumping backwards. v7.0.17 (#3979) 
try to fix #3978 

**Background**
check #3978 

**Research**

I referred the Android platform's solution, because I have android
background, and there is a loop to handle message inside android.


ff007a03c0/core/java/android/os/Handler.java (L701-L706C6)

```
    public final boolean sendMessageDelayed(@NonNull Message msg, long delayMillis) {
        if (delayMillis < 0) {
            delayMillis = 0;
        }
        return sendMessageAtTime(msg, SystemClock.uptimeMillis() + delayMillis);
    }
```


59d9dc1f50/libutils/SystemClock.cpp (L37-L51)

```
/*
 * native public static long uptimeMillis();
 */
int64_t uptimeMillis()
{
    return nanoseconds_to_milliseconds(uptimeNanos());
}


/*
 * public static native long uptimeNanos();
 */
int64_t uptimeNanos()
{
    return systemTime(SYSTEM_TIME_MONOTONIC);
}
```


59d9dc1f50/libutils/Timers.cpp (L32-L55)
```
#if defined(__linux__)
nsecs_t systemTime(int clock) {
    checkClockId(clock);
    static constexpr clockid_t clocks[] = {CLOCK_REALTIME, CLOCK_MONOTONIC,
                                           CLOCK_PROCESS_CPUTIME_ID, CLOCK_THREAD_CPUTIME_ID,
                                           CLOCK_BOOTTIME};
    static_assert(clock_id_max == arraysize(clocks));
    timespec t = {};
    clock_gettime(clocks[clock], &t);
    return nsecs_t(t.tv_sec)*1000000000LL + t.tv_nsec;
}
#else
nsecs_t systemTime(int clock) {
    // TODO: is this ever called with anything but REALTIME on mac/windows?
    checkClockId(clock);


    // Clock support varies widely across hosts. Mac OS doesn't support
    // CLOCK_BOOTTIME (and doesn't even have clock_gettime until 10.12).
    // Windows is windows.
    timeval t = {};
    gettimeofday(&t, nullptr);
    return nsecs_t(t.tv_sec)*1000000000LL + nsecs_t(t.tv_usec)*1000LL;
}
#endif
```
For Linux system, we can use `clock_gettime` api, but it's first
appeared in Mac OSX 10.12.

`man clock_gettime`

The requirement is to find an alternative way to get the timestamp in
microsecond unit, but the `clock_gettime` get nanoseconds, the math
formula is the nanoseconds / 1000 = microsecond. Then I check the
performance of this api + math division.

I used those code to check the `clock_gettime` performance.

```
#include <sys/time.h>
#include <time.h>
#include <stdio.h>
#include <unistd.h>

int main() {
	struct timeval tv;
	struct timespec ts;
	clock_t start;
	clock_t end;
	long t;

	while (1) {
		start = clock();
		gettimeofday(&tv, NULL);
		end = clock();
		printf("gettimeofday clock is %lu\n", end - start);
		printf("gettimeofday is %lld\n", (tv.tv_sec * 1000000LL + tv.tv_usec));

		start = clock();
		clock_gettime(CLOCK_MONOTONIC, &ts);
		t = ts.tv_sec * 1000000L + ts.tv_nsec / 1000L;
		end = clock();
		printf("clock_monotonic clock is %lu\n", end - start);
		printf("clock_monotonic: seconds is %ld, nanoseconds is %ld, sum is %ld\n", ts.tv_sec, ts.tv_nsec, t);

		start = clock();
		clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
		t = ts.tv_sec * 1000000L + ts.tv_nsec / 1000L;
		end = clock();
		printf("clock_monotonic_raw clock is %lu\n", end - start);
		printf("clock_monotonic_raw: nanoseconds is %ld, sum is %ld\n", ts.tv_nsec, t);

		sleep(3);
	}
	
	return 0;
}

```

Here is output:

env: Mac OS M2 chip.

```
gettimeofday clock is 11
gettimeofday is 1709775727153949
clock_monotonic clock is 2
clock_monotonic: seconds is 1525204, nanoseconds is 409453000, sum is 1525204409453
clock_monotonic_raw clock is 2
clock_monotonic_raw: nanoseconds is 770493000, sum is 1525222770493
```
We can see the `clock_gettime` is faster than `gettimeofday`, so there
are no performance risks.

**MacOS solution**

`clock_gettime` api only available until mac os 10.12, for the mac os
older than 10.12, just keep the `gettimeofday`.
check osx version in `auto/options.sh`, then add MACRO in
`auto/depends.sh`, the MACRO is `MD_OSX_HAS_NO_CLOCK_GETTIME`.


**CYGWIN**
According to google search, it seems the
`clock_gettime(CLOCK_MONOTONIC)` is not support well at least 10 years
ago, but I didn't own an windows machine, so can't verify it. so keep
win's solution.

---------

Co-authored-by: winlin <winlinvip@gmail.com>
2024-10-15 17:52:17 +08:00

347 lines
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Makefile
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# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
#
# The Original Code is the Netscape Portable Runtime library.
#
# The Initial Developer of the Original Code is Netscape
# Communications Corporation. Portions created by Netscape are
# Copyright (C) 1994-2000 Netscape Communications Corporation. All
# Rights Reserved.
#
# Contributor(s): Silicon Graphics, Inc.
#
# Portions created by SGI are Copyright (C) 2000-2001 Silicon
# Graphics, Inc. All Rights Reserved.
#
# Alternatively, the contents of this file may be used under the
# terms of the GNU General Public License Version 2 or later (the
# "GPL"), in which case the provisions of the GPL are applicable
# instead of those above. If you wish to allow use of your
# version of this file only under the terms of the GPL and not to
# allow others to use your version of this file under the MPL,
# indicate your decision by deleting the provisions above and
# replace them with the notice and other provisions required by
# the GPL. If you do not delete the provisions above, a recipient
# may use your version of this file under either the MPL or the
# GPL.
# This is the full version of the libst library - modify carefully
VERSION = 1.9
##########################
# Supported OSes:
#
#OS = DARWIN
#OS = LINUX
# Please see the "Other possible defines" section below for
# possible compilation options.
##########################
CC = cc
CXX = g++
AR = ar
LD = ld
RANLIB = ranlib
LN = ln
STATIC_ONLY = yes
SHELL = /bin/sh
ECHO = /bin/echo
BUILD = DBG
TARGETDIR = $(OS)_$(shell uname -r)_$(BUILD)
# For Cygwin, it pass a default OS env, we ignore it.
ifeq ($(OS), Windows_NT)
OS =
endif
# For cygwin/windows, the 'uname -r' generate path with parentheses,
# which cause the make fails, so we use 'uname -s' instead.
ifeq ($(OS), CYGWIN64)
TARGETDIR = $(OS)_$(shell uname -s)_$(BUILD)
endif
DEFINES = -D$(OS)
CFLAGS =
SFLAGS =
ARFLAGS = -r
LNFLAGS = -s
DSO_SUFFIX = so
MAJOR = $(shell echo $(VERSION) | sed 's/^\([^\.]*\).*/\1/')
DESC = st.pc
##########################
# Platform section.
# Possible targets:
TARGETS = darwin-debug darwin-optimized \
linux-debug linux-optimized \
cygwin64-debug
UTEST_TARGETS = darwin-debug-utest linux-debug-utest \
darwin-debug-gcov linux-debug-gcov \
cygwin64-debug-utest
#
# Platform specifics
#
ifeq ($(OS), DARWIN)
EXTRA_OBJS = $(TARGETDIR)/md_darwin.o
LD = cc
SFLAGS = -fPIC -fno-common
DSO_SUFFIX = dylib
CPU_ARCHS = $(shell g++ -dM -E - </dev/null |grep -q '__x86_64' && echo x86_64)
CPU_ARCHS += $(shell g++ -dM -E - </dev/null |grep -q '__aarch64' && echo arm64)
CFLAGS += -arch $(CPU_ARCHS)
LDFLAGS += -arch $(CPU_ARCHS)
LDFLAGS += -dynamiclib -install_name /sw/lib/libst.$(MAJOR).$(DSO_SUFFIX) -compatibility_version $(MAJOR) -current_version $(VERSION)
OTHER_FLAGS = -Wall
DEFINES += -DMD_HAVE_KQUEUE -DMD_HAVE_SELECT
endif
ifeq ($(OS), LINUX)
EXTRA_OBJS = $(TARGETDIR)/md_linux.o $(TARGETDIR)/md_linux2.o
SFLAGS = -fPIC
LDFLAGS = -shared -soname=$(SONAME) -lc
OTHER_FLAGS = -Wall
DEFINES += -DMD_HAVE_EPOLL -DMD_HAVE_SELECT
endif
ifeq ($(OS), CYGWIN64)
EXTRA_OBJS = $(TARGETDIR)/md_cygwin64.o
SFLAGS = -fPIC
DSO_SUFFIX = dll
LDFLAGS = -shared -soname=$(SONAME) -lc
OTHER_FLAGS = -Wall
DEFINES += -DMD_HAVE_SELECT
endif
#
# End of platform section.
##########################
ifeq ($(BUILD), OPT)
OTHER_FLAGS += -O2
else
OTHER_FLAGS += -g -O0
DEFINES += -DDEBUG
endif
##########################
# Other possible defines:
# To use poll(2) instead of select(2) for events checking:
# DEFINES += -DUSE_POLL
# You may prefer to use select for applications that have many threads
# using one file descriptor, and poll for applications that have many
# different file descriptors. With USE_POLL poll() is called with at
# least one pollfd per I/O-blocked thread, so 1000 threads sharing one
# descriptor will poll 1000 identical pollfds and select would be more
# efficient. But if the threads all use different descriptors poll()
# may be better depending on your operating system's implementation of
# poll and select. Really, it's up to you. Oh, and on some platforms
# poll() fails with more than a few dozen descriptors.
#
# Some platforms allow to define FD_SETSIZE (if select() is used), e.g.:
# DEFINES += -DFD_SETSIZE=4096
#
# To use malloc(3) instead of mmap(2) for stack allocation:
# DEFINES += -DMALLOC_STACK
#
# To provision more than the default 16 thread-specific-data keys
# (but not too many!):
# DEFINES += -DST_KEYS_MAX=<n>
#
# To start with more than the default 64 initial pollfd slots
# (but the table grows dynamically anyway):
# DEFINES += -DST_MIN_POLLFDS_SIZE=<n>
#
# Note that you can also add these defines by specifying them as
# make/gmake arguments (without editing this Makefile). For example:
#
# make EXTRA_CFLAGS=-DUSE_POLL <target>
#
# (replace make with gmake if needed).
#
# You can also modify the default selection of an alternative event
# notification mechanism. E.g., to enable kqueue(2) support (if it's not
# enabled by default):
#
# gmake EXTRA_CFLAGS=-DMD_HAVE_KQUEUE <target>
#
# or to disable default epoll(4) support:
#
# make EXTRA_CFLAGS=-UMD_HAVE_EPOLL <target>
#
# or to enable sendmmsg(2) support:
# make EXTRA_CFLAGS="-DMD_HAVE_SENDMMSG -D_GNU_SOURCE"
#
# or to enable stats for ST:
# make EXTRA_CFLAGS=-DDEBUG_STATS
#
# or cache the stack and reuse it:
# make EXTRA_CFLAGS=-DMD_CACHE_STACK
#
# or enable support for valgrind:
# make EXTRA_CFLAGS="-DMD_VALGRIND"
#
# or enable support for asan:
# make EXTRA_CFLAGS="-DMD_ASAN -fsanitize=address -fno-omit-frame-pointer"
#
# or to disable the clock_gettime for MacOS before 10.12, see https://github.com/ossrs/srs/issues/3978
# make EXTRA_CFLAGS=-DMD_OSX_NO_CLOCK_GETTIME
#
# or enable the coverage for utest:
# make UTEST_FLAGS="-fprofile-arcs -ftest-coverage"
#
##########################
CFLAGS += $(DEFINES) $(OTHER_FLAGS) $(EXTRA_CFLAGS)
CFLAGS += $(UTEST_FLAGS)
OBJS = $(TARGETDIR)/sched.o \
$(TARGETDIR)/stk.o \
$(TARGETDIR)/sync.o \
$(TARGETDIR)/key.o \
$(TARGETDIR)/io.o \
$(TARGETDIR)/event.o \
$(TARGETDIR)/common.o
OBJS += $(EXTRA_OBJS)
HEADER = $(TARGETDIR)/st.h
SLIBRARY = $(TARGETDIR)/libst.a
DLIBRARY = $(TARGETDIR)/libst.$(DSO_SUFFIX).$(VERSION)
LINKNAME = libst.$(DSO_SUFFIX)
SONAME = libst.$(DSO_SUFFIX).$(MAJOR)
FULLNAME = libst.$(DSO_SUFFIX).$(VERSION)
ifeq ($(OS), DARWIN)
LINKNAME = libst.$(DSO_SUFFIX)
SONAME = libst.$(MAJOR).$(DSO_SUFFIX)
FULLNAME = libst.$(VERSION).$(DSO_SUFFIX)
endif
ifeq ($(STATIC_ONLY), yes)
LIBRARIES = $(SLIBRARY)
else
LIBRARIES = $(SLIBRARY) $(DLIBRARY)
endif
ifeq ($(OS),)
ST_ALL = unknown
else
ST_ALL = $(TARGETDIR) $(LIBRARIES) $(HEADER) $(DESC)
endif
all: $(ST_ALL)
unknown:
@echo
@echo "Please specify one of the following targets:"
@echo
@for target in $(TARGETS); do echo $$target; done
@echo
@for target in $(UTEST_TARGETS); do echo $$target; done
@echo
st.pc: st.pc.in
sed "s/@VERSION@/${VERSION}/g" < $< > $@
$(TARGETDIR):
if [ ! -d $(TARGETDIR) ]; then mkdir $(TARGETDIR); fi
$(SLIBRARY): $(OBJS)
$(AR) $(ARFLAGS) $@ $(OBJS)
$(RANLIB) $@
rm -f obj; $(LN) $(LNFLAGS) $(TARGETDIR) obj
$(DLIBRARY): $(OBJS:%.o=%-pic.o)
$(LD) $(LDFLAGS) $^ -o $@
if test "$(LINKNAME)"; then \
cd $(TARGETDIR); \
rm -f $(SONAME) $(LINKNAME); \
$(LN) $(LNFLAGS) $(FULLNAME) $(SONAME); \
$(LN) $(LNFLAGS) $(FULLNAME) $(LINKNAME); \
fi
$(HEADER): public.h
rm -f $@
cp public.h $@
$(TARGETDIR)/%.o: %.S
$(CC) $(CFLAGS) -c $< -o $@
$(TARGETDIR)/%.o: %.c common.h md.h
$(CC) $(CFLAGS) -c $< -o $@
# Note that we use C++98 standard for the C++ files.
$(TARGETDIR)/%.o: %.cc common.h md.h
$(CXX) $(CFLAGS) -c $< -o $@ -std=c++98
clean:
rm -rf *_OPT *_DBG obj st.pc
##########################
# Pattern rules:
ifneq ($(SFLAGS),)
# Compile with shared library options if it's a C file
$(TARGETDIR)/%-pic.o: %.c common.h md.h
$(CC) $(CFLAGS) $(SFLAGS) -c $< -o $@
endif
# Compile assembly as normal or C as normal if no SFLAGS
%-pic.o: %.o
rm -f $@; $(LN) $(LNFLAGS) $(<F) $@
##########################
# Target rules:
darwin-debug:
$(MAKE) OS="DARWIN" BUILD="DBG"
darwin-optimized:
$(MAKE) OS="DARWIN" BUILD="OPT"
linux-debug:
$(MAKE) OS="LINUX" BUILD="DBG"
linux-optimized:
$(MAKE) OS="LINUX" BUILD="OPT"
cygwin64-debug:
$(MAKE) OS="CYGWIN64" BUILD="DBG"
darwin-debug-utest:
@echo "Build utest for state-threads"
$(MAKE) OS="DARWIN" BUILD="DBG"
cd utest && $(MAKE)
linux-debug-utest:
@echo "Build utest for state-threads"
$(MAKE) OS="LINUX" BUILD="DBG"
cd utest && $(MAKE)
cygwin64-debug-utest:
@echo "Build utest for state-threads"
$(MAKE) OS="CYGWIN64" BUILD="DBG"
cd utest && $(MAKE) UTEST_FLAGS="-std=gnu++0x" # @see https://www.codenong.com/18784112/
darwin-debug-gcov:
@echo "Build utest with gcov for state-threads"
$(MAKE) OS="DARWIN" BUILD="DBG" UTEST_FLAGS="-fprofile-arcs -ftest-coverage" STATIC_ONLY=yes
cd utest && $(MAKE) UTEST_FLAGS="-fprofile-arcs -ftest-coverage"
linux-debug-gcov:
@echo "Build utest with gcov for state-threads"
$(MAKE) OS="LINUX" BUILD="DBG" UTEST_FLAGS="-fprofile-arcs -ftest-coverage" STATIC_ONLY=yes
cd utest && $(MAKE) UTEST_FLAGS="-fprofile-arcs -ftest-coverage"
##########################
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