mdbx-cmake: support of MDBX_USE_FALLOCATE for CMake and Conan.

CMakeLists.txt

@@ -705,6 +705,8 @@ mark_as_advanced(MDBX_ENABLE_PROFGC)
 add_option(MDBX ENABLE_DBI_SPARSE
            "Support for sparse sets of DBI handles to reduce overhead when starting and processing transactions" ON)
 add_option(MDBX ENABLE_DBI_LOCKFREE "Support for deferred releasing and a lockfree path to quickly open DBI handles" ON)
+add_option(MDBX USE_FALLOCATE "Using posix_fallocate() or fcntl(F_PREALLOCATE) on OSX" AUTO)
+mark_as_advanced(MDBX_USE_FALLOCATE)
 
 if(NOT MDBX_AMALGAMATED_SOURCE)
   if(CMAKE_CONFIGURATION_TYPES OR CMAKE_BUILD_TYPE_UPPERCASE STREQUAL "DEBUG")

conanfile.py

@@ -82,6 +82,7 @@ class libmdbx(ConanFile):
         'mdbx.use_mincore': ['Auto', True, False],
         'mdbx.use_ofdlocks': ['Auto', True, False],
         'mdbx.use_sendfile': ['Auto', True, False],
+        'mdbx.use_fallocate': ['Auto', True, False],
         'mdbx.without_msvc_crt': ['Default', True, False],
         'shared': [True, False],
     }
@@ -113,6 +114,7 @@ class libmdbx(ConanFile):
         'mdbx.use_mincore': 'Auto',
         'mdbx.use_ofdlocks': 'Auto',
         'mdbx.use_sendfile': 'Auto',
+        'mdbx.use_fallocate': 'Auto',
         'mdbx.without_msvc_crt': 'Default',
         'shared': True,
     }
@@ -143,7 +145,8 @@ class libmdbx(ConanFile):
         'mdbx.use_copyfilerange': 'Advanced: Use `copy_file_range()` syscall. ',
         'mdbx.use_mincore': "Use Unix' `mincore()` to determine whether database pages are resident in memory. ",
         'mdbx.use_ofdlocks': 'Advanced: Use POSIX OFD-locks. ',
-        'mdbx.use_sendfile': 'Advancedc: Use `sendfile()` syscall. ',
+        'mdbx.use_sendfile': 'Advanced: Use `sendfile()` syscall. ',
+        'mdbx.use_fallocate': 'Advanced: Use posix_fallocate() or fcntl(F_PREALLOCATE) on OSX. ',
         'mdbx.without_msvc_crt': 'Avoid dependence from MSVC CRT and use ntdll.dll instead. ',
     }
 
@@ -160,6 +163,7 @@ class libmdbx(ConanFile):
             self.options.rm_safe('mdbx.mmap_incoherent_file_write')
             self.options.rm_safe('mdbx.use_mincore')
             self.options.rm_safe('mdbx.use_ofdlocks')
+            self.options.rm_safe('mdbx.use_fallocate')
         else:
             self.options.rm_safe('mdbx.without_msvc_crt')
         if is_apple_os(self):

src/config.h.in

@@ -63,6 +63,11 @@
 
 #cmakedefine01 MDBX_USE_MINCORE
 
+#cmakedefine MDBX_USE_FALLOCATE_AUTO
+#ifndef MDBX_USE_FALLOCATE_AUTO
+#cmakedefine01 MDBX_USE_FALLOCATE
+#endif /* MDBX_USE_FALLOCATE */
+
 /* Build Info */
 #ifndef MDBX_BUILD_TIMESTAMP
 #cmakedefine MDBX_BUILD_TIMESTAMP "@MDBX_BUILD_TIMESTAMP@"

src/global.c

@@ -379,6 +379,7 @@ __dll_export
 #else /* Windows */
     " MDBX_LOCKING=" MDBX_LOCKING_CONFIG
     " MDBX_USE_OFDLOCKS=" MDBX_USE_OFDLOCKS_CONFIG
+    " MDBX_USE_FALLOCATE=" MDBX_USE_FALLOCATE_CONFIG
 #endif /* !Windows */
     " MDBX_CACHELINE_SIZE=" MDBX_STRINGIFY(MDBX_CACHELINE_SIZE)
     " MDBX_CPU_WRITEBACK_INCOHERENT=" MDBX_STRINGIFY(MDBX_CPU_WRITEBACK_INCOHERENT)

src/options.h

@@ -358,7 +358,7 @@
 #error MDBX_USE_COPYFILERANGE must be defined as 0 or 1
 #endif /* MDBX_USE_COPYFILERANGE */
 
-/** Advanced: Using posix_fallocate() or fcntl(F_PREALLOCATE) (autodetection by default). */
+/** Advanced: Using posix_fallocate() or fcntl(F_PREALLOCATE) on OSX (autodetection by default). */
 #ifndef MDBX_USE_FALLOCATE
 #if defined(__APPLE__)
 #define MDBX_USE_FALLOCATE 0 /* Too slow and unclean, but not required to prevent SIGBUS */
@@ -367,8 +367,11 @@
 #else
 #define MDBX_USE_FALLOCATE 0
 #endif
+#define MDBX_USE_FALLOCATE_CONFIG "AUTO=" MDBX_STRINGIFY(MDBX_USE_FALLOCATE)
 #elif !(MDBX_USE_FALLOCATE == 0 || MDBX_USE_FALLOCATE == 1)
 #error MDBX_USE_FALLOCATE must be defined as 0 or 1
+#else
+#define MDBX_USE_FALLOCATE_CONFIG MDBX_STRINGIFY(MDBX_USE_FALLOCATE)
 #endif /* MDBX_USE_FALLOCATE */
 
 //------------------------------------------------------------------------------