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Introduce LibCore and move GElapsedTimer => CElapsedTimer.

I need a layer somewhere between AK (usable both by userspace and kernel)
and LibGUI (usable by userspace except WindowServer.) So here's LibCore.
This commit is contained in:
Andreas Kling 2019-04-10 16:14:44 +02:00
parent a74f3615ac
commit 5e0577a042
21 changed files with 98 additions and 37 deletions

3
LibCore/.gitignore vendored Normal file
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*.o
*.d
libcore.a

29
LibCore/CElapsedTimer.cpp Normal file
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#include <LibCore/CElapsedTimer.h>
#include <AK/Assertions.h>
#include <sys/time.h>
void CElapsedTimer::start()
{
m_valid = true;
gettimeofday(&m_start_time, nullptr);
}
inline void timersub(const struct timeval* a, const struct timeval* b, struct timeval* result)
{
result->tv_sec = a->tv_sec - b->tv_sec;
result->tv_usec = a->tv_usec - b->tv_usec;
if (result->tv_usec < 0) {
--result->tv_sec;
result->tv_usec += 1000000;
}
}
int CElapsedTimer::elapsed() const
{
ASSERT(is_valid());
struct timeval now;
gettimeofday(&now, nullptr);
struct timeval diff;
timersub(&now, &m_start_time, &diff);
return diff.tv_sec * 1000 + diff.tv_usec / 1000;
}

16
LibCore/CElapsedTimer.h Normal file
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#pragma once
#include <time.h>
class CElapsedTimer {
public:
CElapsedTimer() { }
bool is_valid() const { return m_valid; }
void start();
int elapsed() const;
private:
bool m_valid { false };
struct timeval m_start_time { 0, 0 };
};

32
LibCore/Makefile Normal file
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OBJS = \
CElapsedTimer.o
LIBS =
LIBRARY = libcore.a
STANDARD_FLAGS = -std=c++17 -Wno-sized-deallocation
WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
FLAVOR_FLAGS = -fno-exceptions -fno-rtti
OPTIMIZATION_FLAGS = -Os
INCLUDE_FLAGS = -I../LibC -I../Servers -I.. -I.
DEFINES = -DSERENITY -DUSERLAND -DSANITIZE_PTRS -DLIBGUI
CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
CXX = i686-pc-serenity-g++
LD = i686-pc-serenity-ld
AR = i686-pc-serenity-ar
all: $(LIBRARY)
$(LIBRARY): $(OBJS)
@echo "LIB $@"; $(AR) rcs $@ $(OBJS) $(LIBS)
.cpp.o:
@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
-include $(OBJS:%.o=%.d)
clean:
@echo "CLEAN"; rm -f $(LIBRARY) $(OBJS) *.d