Add a test for sorter worker threads and sqlite3_backup_init

Contributed by @mtrossbach (PR #307)

Author: utelle

.github/workflows/ci4sqlite3mc.yml

@@ -67,6 +67,11 @@ jobs:
         make rekeytest
         ./rekeytest
 
+    - name: Thread tests
+      run: |
+        make threadtest
+        ./threadtest
+
   android_build:
     name: Android (API ${{ matrix.api-level }})
     runs-on: ubuntu-latest

Makefile.am

@@ -165,7 +165,7 @@ sqlite3shell_LDFLAGS += -no-install
 endif
 
 # Tests for the cryptographic primitives (not installed, built like the shell).
-check_PROGRAMS = cryptotest tempfiletest oomtest rekeytest
+check_PROGRAMS = cryptotest tempfiletest oomtest rekeytest threadtest
 cryptotest_SOURCES = test/cryptotest.c
 cryptotest_CFLAGS = $(sqlite3shell_CFLAGS)
 cryptotest_LDADD = $(sqlite3shell_LDADD)
@@ -182,3 +182,7 @@ rekeytest_SOURCES = test/rekeytest.c
 rekeytest_CFLAGS = $(sqlite3shell_CFLAGS)
 rekeytest_LDADD = $(sqlite3shell_LDADD)
 rekeytest_LDFLAGS = $(sqlite3shell_LDFLAGS)
+threadtest_SOURCES = test/threadtest.c
+threadtest_CFLAGS = $(sqlite3shell_CFLAGS)
+threadtest_LDADD = $(sqlite3shell_LDADD)
+threadtest_LDFLAGS = $(sqlite3shell_LDFLAGS)