Unix builds now assume the presence of nanosleep() in the standard library.

The -DHAVE_NANOSLEEP=0 compile-time option can be used to build on systems
(if any still exist) where this is not the case.

FossilOrigin-Name: 779d5dc8797ea246d0397f7e94b1be716b0baa735e8d9f5a6fc4cffd887a7420

7 files changed, 20 insertions, 23 deletions

diff --git a/Makefile.linux-gcc b/Makefile.linux-gcc
index ad5d4dd09..fe7349ad4 100644
--- a/Makefile.linux-gcc
+++ b/Makefile.linux-gcc
@@ -22,12 +22,6 @@ TOP = ../sqlite
 BCC = gcc -g -O0
 #BCC = /opt/ancic/bin/c89 -0
 
-#### If the target operating system supports the "usleep()" system
-#    call, then define the HAVE_USLEEP macro for all C modules.
-#
-#USLEEP = 
-USLEEP = -DHAVE_USLEEP=1
-
 #### If you want the SQLite library to be safe for use within a 
 #    multi-threaded program, then define the following macro
 #    appropriately:
diff --git a/manifest b/manifest
index bd8750b7d..fe38d65c6 100644
--- a/manifest
+++ b/manifest
@@ -1,10 +1,10 @@
-C Performance\soptimization\sfor\sJSON\srendering\slogic.
-D 2023-08-02T16:06:02.660
+C Unix\sbuilds\snow\sassume\sthe\spresence\sof\snanosleep()\sin\sthe\sstandard\slibrary.\nThe\s-DHAVE_NANOSLEEP=0\scompile-time\soption\scan\sbe\sused\sto\sbuild\son\ssystems\n(if\sany\sstill\sexist)\swhere\sthis\sis\snot\sthe\scase.
+D 2023-08-03T12:41:30.503
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
 F Makefile.in 0f4cb3955aaff8a40ec3857ba1784bd98b69802e51eff979f874b65713b627b2
-F Makefile.linux-gcc f609543700659711fbd230eced1f01353117621dccae7b9fb70daa64236c5241
+F Makefile.linux-gcc f3842a0b1efbfbb74ac0ef60e56b301836d05b4d867d014f714fa750048f1ab6
 F Makefile.msc 7248d860f71ab164b4cec3c415e6cc1bd9fee860c370d65bd8bb49e9572521e2
 F README.md c1c4218efcc4071a6e26db2b517fdbc1035696a29b370edd655faddbef02b224
 F VERSION c6366dc72582d3144ce87b013cc35fe48d62f6d07d5be0c9716ea33c862144aa
@@ -606,7 +606,7 @@ F src/insert.c 3f0a94082d978bbdd33c38fefea15346c6c6bffb70bc645a71dc0f1f87dd3276
 F src/json.c cea55234b99879a6c3be04cd01f32e83f760672356415b541929cdd16441ede3
 F src/legacy.c d7874bc885906868cd51e6c2156698f2754f02d9eee1bae2d687323c3ca8e5aa
 F src/loadext.c 176d6b2cb18a6ad73b133db17f6fc351c4d9a2d510deebdb76c22bde9cfd1465
-F src/main.c 512b1d45bc556edf4471a845afb7ba79e64bd5b832ab222dc195c469534cd002
+F src/main.c 6577cd908f254de4d109df58323421f5934f674f5b7ee4b4b337a055458ecad3
 F src/malloc.c 47b82c5daad557d9b963e3873e99c22570fb470719082c6658bf64e3012f7d23
 F src/mem0.c 6a55ebe57c46ca1a7d98da93aaa07f99f1059645
 F src/mem1.c 3bb59158c38e05f6270e761a9f435bf19827a264c13d1631c58b84bdc96d73b2
@@ -627,7 +627,7 @@ F src/os.h 1ff5ae51d339d0e30d8a9d814f4b8f8e448169304d83a7ed9db66a65732f3e63
 F src/os_common.h 6c0eb8dd40ef3e12fe585a13e709710267a258e2c8dd1c40b1948a1d14582e06
 F src/os_kv.c 4d39e1f1c180b11162c6dc4aa8ad34053873a639bac6baae23272fc03349986a
 F src/os_setup.h 6011ad7af5db4e05155f385eb3a9b4470688de6f65d6166b8956e58a3d872107
-F src/os_unix.c 95b407307deb902a3bd9a5d5666c7838709cccb337baeee6ef0a53f512d3673e
+F src/os_unix.c 2e8b12107f75d1bd16412f312b4c5d5103191807a37836d3b81beb26436ad81b
 F src/os_win.c 7038223a1cda0a47e2ab4db47f63bf1833fe53ba0542f0f283a062ea13894103
 F src/os_win.h 7b073010f1451abe501be30d12f6bc599824944a
 F src/pager.c 5ddf3a74c633a008ea6b2f5b3186167e88e2c8ca8a252ecab06ab3f1eb48e60f
@@ -1945,7 +1945,7 @@ F tool/GetFile.cs 47852aa0d806fe47ed1ac5138bdce7f000fe87aaa7f28107d0cb1e26682aeb
 F tool/GetTclKit.bat d84033c6a93dfe735d247f48ba00292a1cc284dcf69963e5e672444e04534bbf
 F tool/Replace.cs 02c67258801c2fb5f63231e0ac0f220b4b36ba91
 F tool/build-all-msvc.bat c817b716e0edeecaf265a6775b63e5f45c34a6544f1d4114a222701ed5ac79ab x
-F tool/build-shell.sh 950f47c6174f1eea171319438b93ba67ff5bf367
+F tool/build-shell.sh f193b5e3eb4afcb4abbf96bf1475be6cfb74763ee2e50c82bc7ca105e8a136c5
 F tool/cg_anno.tcl c1f875f5a4c9caca3d59937b16aff716f8b1883935f1b4c9ae23124705bc8099 x
 F tool/checkSpacing.c 810e51703529a204fc4e1eb060e9ab663e3c06d2
 F tool/custom.txt 6cdf298f43e1db4bb91406d14777669b8fb1df790837823fa6754c4308decc27
@@ -2026,7 +2026,7 @@ F tool/varint.c 5d94cb5003db9dbbcbcc5df08d66f16071aee003
 F tool/vdbe-compress.tcl 1dcb7632e57cf57105248029e6e162fddaf6c0fccb3bb9e6215603752c5a2d4a
 F tool/vdbe_profile.tcl 3ac5a4a9449f4baf77059358ea050db3e34395ccf59c5464d29b91746d5b961e
 F tool/warnings-clang.sh bbf6a1e685e534c92ec2bfba5b1745f34fb6f0bc2a362850723a9ee87c1b31a7
-F tool/warnings.sh ab651bb82586c43ff8b560beceac959735bf917b44c5e0f67ba3426e474f29f8
+F tool/warnings.sh 49a486c5069de041aedcbde4de178293e0463ae9918ecad7539eedf0ec77a139
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
 F vsixtest/App.xaml b76d3b48860e7454775c47ea38ffea9c4abe3e85
 F vsixtest/App.xaml.cpp 41158ee43269820136fa3bba00c0bd91b26cc38b650ee392aec2a8d823e54318
@@ -2049,8 +2049,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P c4347e4400e96f932ac12f8f22484a2ebce2a578d1b2181977954c432f117bfd
-R a3168d15b44149a629121fdff1d59acd
+P ea0b9aecbaca9a8e784fd2bcb50f78cbdcf4c5cfb45a7700bb222e4cc104c644
+R 31ad76526bf706e018f4fff70c0faaae
 U drh
-Z 37bd268b83df81194e3e4e7be36a0655
+Z ffe3b8625e4fbe0c7711c5e4b79ea34e
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index ca5b942d1..d1cd5ace0 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-ea0b9aecbaca9a8e784fd2bcb50f78cbdcf4c5cfb45a7700bb222e4cc104c644
\ No newline at end of file
+779d5dc8797ea246d0397f7e94b1be716b0baa735e8d9f5a6fc4cffd887a7420
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
index 8f21af13e..35851b64e 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1665,9 +1665,9 @@ static int sqliteDefaultBusyCallback(
   void *ptr,               /* Database connection */
   int count                /* Number of times table has been busy */
 ){
-#if SQLITE_OS_WIN || HAVE_USLEEP
+#if SQLITE_OS_WIN || !defined(HAVE_NANOSLEEP) || HAVE_NANOSLEEP
   /* This case is for systems that have support for sleeping for fractions of
-  ** a second.  Examples:  All windows systems, unix systems with usleep() */
+  ** a second.  Examples:  All windows systems, unix systems with nanosleep() */
   static const u8 delays[] =
      { 1, 2, 5, 10, 15, 20, 25, 25,  25,  50,  50, 100 };
   static const u8 totals[] =
diff --git a/src/os_unix.c b/src/os_unix.c
index aed4ac213..59f67d142 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -6715,12 +6715,17 @@ static int unixRandomness(sqlite3_vfs *NotUsed, int nBuf, char *zBuf){
 ** than the argument.
 */
 static int unixSleep(sqlite3_vfs *NotUsed, int microseconds){
-#if OS_VXWORKS || _POSIX_C_SOURCE >= 199309L
+#if !defined(HAVE_NANOSLEEP) || HAVE_NANOSLEEP+0
   struct timespec sp;
-
   sp.tv_sec = microseconds / 1000000;
   sp.tv_nsec = (microseconds % 1000000) * 1000;
+
+  /* Almost all modern unix systems support nanosleep().  But if you are
+  ** compiling for one of the rare exceptions, you can use
+  ** -DHAVE_NANOSLEEP=0 (perhaps in conjuction with -DHAVE_USLEEP if
+  ** usleep() is available) in order to bypass the use of nanosleep() */
   nanosleep(&sp, NULL);
+
   UNUSED_PARAMETER(NotUsed);
   return microseconds;
 #elif defined(HAVE_USLEEP) && HAVE_USLEEP
diff --git a/tool/build-shell.sh b/tool/build-shell.sh
index 6a48299d7..a57f75303 100644
--- a/tool/build-shell.sh
+++ b/tool/build-shell.sh
@@ -16,7 +16,6 @@ gcc -o sqlite3 -g -Os -I. \
    -DSQLITE_ENABLE_FTS4 \
    -DSQLITE_ENABLE_RTREE \
    -DHAVE_READLINE \
-   -DHAVE_USLEEP=1 \
    ../sqlite/src/shell.c \
    ../sqlite/src/test_vfstrace.c \
    sqlite3.c -ldl -lreadline -lncurses
diff --git a/tool/warnings.sh b/tool/warnings.sh
index 60d2b4210..2b962d15e 100644
--- a/tool/warnings.sh
+++ b/tool/warnings.sh
@@ -32,7 +32,6 @@ if test x`uname` = 'xLinux'; then
 echo '********** Android configuration ******************************'
 echo '**********    ' Options: $WARNING_ANDROID_OPTS
 gcc -c \
-  -DHAVE_USLEEP=1 \
   -DSQLITE_HAVE_ISNAN \
   -DSQLITE_DEFAULT_JOURNAL_SIZE_LIMIT=1048576 \
   -DSQLITE_THREADSAFE=2 \