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/*
* Copyright (C) 2012-2016 Robin Haberkorn
*
* 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 <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif
#include <glib.h>
#include "sciteco.h"
#include "memory.h"
#include "error.h"
#include "undo.h"
#ifdef HAVE_WINDOWS_H
/* here it shouldn't cause conflicts with other headers */
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <psapi.h>
#endif
namespace SciTECO {
MemoryLimit memlimit;
#ifdef HAVE_MALLINFO
gsize
MemoryLimit::get_usage(void)
{
struct mallinfo info = mallinfo();
/*
* NOTE: `uordblks` is an int and thus prone
* to wrap-around issues.
*
* Unfortunately, the only other machine readable
* alternative is malloc_info() which prints
* into a FILE * stream [sic!] and is unspeakably
* slow even if writing to an unbuffered fmemopen()ed
* stream.
*/
return info.uordblks;
}
#elif defined(G_OS_WIN32)
gsize
MemoryLimit::get_usage(void)
{
PROCESS_MEMORY_COUNTERS info;
/*
* This __should__ not fail since the current process has
* PROCESS_ALL_ACCESS, but who knows...
* Since memory limiting cannot be turned off when this
* happens, we can just as well terminate abnormally.
*/
if (G_UNLIKELY(!GetProcessMemoryInfo(GetCurrentProcess(),
&info, sizeof(info)))) {
gchar *msg = g_win32_error_message(GetLastError());
g_error("Cannot get memory usage: %s", msg);
/* shouldn't be reached */
g_free(msg);
return 0;
}
return info.WorkingSetSize;
}
#else
#define USE_MEMORY_COUNTING
static gsize memory_usage = 0;
gsize
MemoryLimit::get_usage(void)
{
return memory_usage;
}
#endif /* !HAVE_MALLINFO && !G_OS_WIN32 */
void
MemoryLimit::set_limit(gsize new_limit)
{
gsize memory_usage = get_usage();
if (G_UNLIKELY(new_limit && memory_usage > new_limit)) {
gchar *usage_str = g_format_size(memory_usage);
gchar *limit_str = g_format_size(new_limit);
Error err("Cannot set undo memory limit (%s): "
"Current usage too large (%s).",
limit_str, usage_str);
g_free(limit_str);
g_free(usage_str);
throw err;
}
undo.push_var(limit) = new_limit;
}
void
MemoryLimit::check(void)
{
if (G_UNLIKELY(limit && get_usage() > limit)) {
gchar *limit_str = g_format_size(limit);
Error err("Memory limit (%s) exceeded. See <EJ> command.",
limit_str);
g_free(limit_str);
throw err;
}
}
void *
Object::operator new(size_t size) noexcept
{
#ifdef USE_MEMORY_COUNTING
memory_usage += size;
#endif
/*
* Since we've got the sized-delete operator
* below, we could allocate via g_slice.
*
* Using g_slice however would render malloc_trim()
* ineffective. Also, it has been shown to be
* unnecessary on Linux/glibc.
* Glib is guaranteed to use the system malloc(),
* so g_malloc() cooperates with malloc_trim().
*
* On Windows (even Windows 2000), the slice allocator
* did not show any significant performance boost
* either. Also, since g_slice never seems to return
* memory to the OS and we cannot force it to do so,
* it will not cooperate with the Windows-specific
* memory measurement and it is hard to recover
* from memory limit exhaustions.
*/
return g_malloc(size);
}
void
Object::operator delete(void *ptr, size_t size) noexcept
{
g_free(ptr);
#ifdef USE_MEMORY_COUNTING
memory_usage -= size;
#endif
}
} /* namespace SciTECO */
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