Add an unpatched version of xz, XZ Utils, to /trunk/deps/third_party

xz/src/xz/hardware.c

+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       hardware.c
+/// \brief      Detection of available hardware resources
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "private.h"
+#include "tuklib_cpucores.h"
+
+
+/// Maximum number of free *coder* threads. This can be set with
+/// the --threads=NUM command line option.
+static uint32_t threadlimit;
+
+/// Memory usage limit
+static uint64_t memlimit;
+
+/// Total amount of physical RAM
+static uint64_t total_ram;
+
+
+extern void
+hardware_threadlimit_set(uint32_t new_threadlimit)
+{
+        if (new_threadlimit == 0) {
+                // The default is the number of available CPU cores.
+                threadlimit = tuklib_cpucores();
+                if (threadlimit == 0)
+                        threadlimit = 1;
+        } else {
+                threadlimit = new_threadlimit;
+        }
+
+        return;
+}
+
+
+extern uint32_t
+hardware_threadlimit_get(void)
+{
+        return threadlimit;
+}
+
+
+extern void
+hardware_memlimit_set(uint64_t new_memlimit)
+{
+        if (new_memlimit != 0) {
+                memlimit = new_memlimit;
+        } else {
+                // The default depends on the amount of RAM but so that
+                // on "low-memory" systems the relative limit is higher
+                // to make it more likely that files created with "xz -9"
+                // will still decompress without overriding the limit
+                // manually.
+                //
+                // If 40 % of RAM is 80 MiB or more, use 40 % of RAM as
+                // the limit.
+                memlimit = 40 * total_ram / 100;
+                if (memlimit < UINT64_C(80) * 1024 * 1024) {
+                        // If 80 % of RAM is less than 80 MiB,
+                        // use 80 % of RAM as the limit.
+                        memlimit = 80 * total_ram / 100;
+                        if (memlimit > UINT64_C(80) * 1024 * 1024) {
+                                // Otherwise use 80 MiB as the limit.
+                                memlimit = UINT64_C(80) * 1024 * 1024;
+                        }
+                }
+        }
+
+        return;
+}
+
+
+extern void
+hardware_memlimit_set_percentage(uint32_t percentage)
+{
+        assert(percentage > 0);
+        assert(percentage <= 100);
+
+        memlimit = percentage * total_ram / 100;
+        return;
+}
+
+
+extern uint64_t
+hardware_memlimit_get(void)
+{
+        return memlimit;
+}
+
+
+extern void
+hardware_init(void)
+{
+        // Get the amount of RAM. If we cannot determine it,
+        // use the assumption defined by the configure script.
+        total_ram = lzma_physmem();
+        if (total_ram == 0)
+                total_ram = (uint64_t)(ASSUME_RAM) * 1024 * 1024;
+
+        // Set the defaults.
+        hardware_memlimit_set(0);
+        hardware_threadlimit_set(0);
+        return;
+}