Fix #6293. Don't use {{{mincore()}}} on Darwin.

git-svn-id: file:///svn/toku/tokudb@54523 c7de825b-a66e-492c-adef-691d508d4ae1

cmake_modules/TokuFeatureDetection.cmake

@@ -59,6 +59,7 @@ if (NOT CMAKE_SYSTEM_NAME STREQUAL FreeBSD)
 endif ()
 check_symbol_exists(O_DIRECT "fcntl.h" HAVE_O_DIRECT)
 check_symbol_exists(F_NOCACHE "fcntl.h" HAVE_F_NOCACHE)
+check_symbol_exists(MAP_ANONYMOUS "sys/mman.h" HAVE_MAP_ANONYMOUS)
 
 include(CheckFunctionExists)
 
@@ -71,6 +72,7 @@ check_function_exists(valloc HAVE_VALLOC)
 ## check whether we have random_r or nrand48 to use as a reentrant random function
 check_function_exists(nrand48 HAVE_NRAND48)
 check_function_exists(random_r HAVE_RANDOM_R)
+check_function_exists(mincore HAVE_MINCORE)
 
 set(EXTRA_SYSTEM_LIBS "")
 check_function_exists(dlsym HAVE_DLSYM_WITHOUT_DL)

portability/huge_page_detection.cc

@@ -50,9 +50,15 @@ static bool check_huge_pages_config_file(const char *fname)
 static bool check_huge_pages_in_practice(void)
 // Effect: Return true if huge pages appear to be defined in practice.
 {
+#ifdef HAVE_MINCORE    
+#ifdef HAVE_MAP_ANONYMOUS    
+    const int map_anonymous = MAP_ANONYMOUS;
+#else
+    const int map_anonymous = MAP_ANON;
+#endif
     const size_t TWO_MB = 2UL*1024UL*1024UL;
 
-    void *first = mmap(NULL, 2*TWO_MB, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+    void *first = mmap(NULL, 2*TWO_MB, PROT_READ|PROT_WRITE, MAP_PRIVATE|map_anonymous, -1, 0);
     if ((long)first==-1) perror("mmap failed");
     {
         int r = munmap(first, 2*TWO_MB);
@@ -60,7 +66,7 @@ static bool check_huge_pages_in_practice(void)
     }
 
     void *second_addr = (void*)(((unsigned long)first + TWO_MB) & ~(TWO_MB -1));
-    void *second = mmap(second_addr, TWO_MB, PROT_READ|PROT_WRITE, MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+    void *second = mmap(second_addr, TWO_MB, PROT_READ|PROT_WRITE, MAP_FIXED|MAP_PRIVATE|map_anonymous, -1, 0);
     if ((long)second==-1) perror("mmap failed");
     assert((long)second%TWO_MB == 0);
 
@@ -96,6 +102,10 @@ static bool check_huge_pages_in_practice(void)
     } else {
         return false;
     }
+#else
+    // No mincore, so no way to check this in practice
+    return false;
+#endif
 }
 
 bool complain_and_return_true_if_huge_pages_are_enabled(void)