diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 9aa66f3..b294bfa 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -34,7 +34,7 @@ jobs:
       - name: autogen
         run: ./autogen.sh
       - name: configure
-        run: ./configure ${{matrix.assert}} --enable-checks --enable-checks-pthreads --enable-checks-python CC='${{matrix.cc}}' CFLAGS='${{matrix.opt}}'
+        run: ./configure ${{matrix.assert}} --enable-checks --enable-checks-python CC='${{matrix.cc}}' CFLAGS='${{matrix.opt}}'
       - name: make
         run: make
       - name: check
@@ -76,7 +76,7 @@ jobs:
       - name: autogen
         run: ./autogen.sh
       - name: configure
-        run: ./configure --host='${{matrix.cross.arch}}-unknown-elf' --enable-checks --enable-checks-pthreads --enable-checks-python CC='${{matrix.cross.cprefix}}gcc'
+        run: ./configure --host='${{matrix.cross.arch}}-unknown-elf' --enable-checks --enable-checks-python CC='${{matrix.cross.cprefix}}gcc'
       - name: make
         run: make
       - name: check
@@ -100,7 +100,7 @@ jobs:
       - name: autogen
         run: ./autogen.sh
       - name: configure
-        run: ./configure --enable-checks --enable-checks-pthreads --enable-checks-python --without-${{matrix.packages.without}} ${{matrix.packages.dependencies}}
+        run: ./configure --enable-checks --enable-checks-python --without-${{matrix.packages.without}} ${{matrix.packages.dependencies}}
       - name: make
         run: make
       - name: check
@@ -139,7 +139,7 @@ jobs:
       - name: extract
         run: tar -xzf "libkernaux-$(cat VERSION).tar.gz"
       - name: configure
-        run: cd "libkernaux-$(cat VERSION)" && ./configure --enable-checks --enable-checks-pthreads --enable-checks-python
+        run: cd "libkernaux-$(cat VERSION)" && ./configure --enable-checks --enable-checks-python
       - name: make
         run: cd "libkernaux-$(cat VERSION)" && make
       - name: check
diff --git a/README.md b/README.md
index 2212113..c41949e 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,6 @@ zero). Work-in-progress APIs can change at any time.
   * [Memory allocator](/include/kernaux/generic/malloc.h) (*non-breaking since* **0.5.0**)
     * [Example](/examples/generic_malloc.c)
   * [Mutex](/include/kernaux/generic/mutex.h) (*non-breaking since* **0.5.0**)
-    * [Example](/examples/generic_mutex.c)
 * Algorithms
   * [Free list memory allocator](/include/kernaux/free_list.h) (*non-breaking since* **0.5.0**)
   * [Simple command line parser](/include/kernaux/cmdline.h) (*non-breaking since* **0.2.0**)
@@ -136,7 +135,6 @@ stable options.
 * `--enable-checks` - enable usual tests and examples
 * `--enable-checks-all` - enable all checks
 * `--enable-checks-cppcheck` - enable cppcheck
-* `--enable-checks-pthreads` - enable tests that require pthreads
 * `--enable-checks-python` - enable tests that require Python 3 with YAML and
   Jinja2
 * `--enable-pkg-config[=PATH]` - install pkg-config files
diff --git a/configure.ac b/configure.ac
index 259445f..e59ff0e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -57,7 +57,6 @@ AC_ARG_ENABLE([freestanding],    AS_HELP_STRING([--enable-freestanding],    [bui
 AC_ARG_ENABLE([checks],          AS_HELP_STRING([--enable-checks],          [enable usual tests and examples]))
 AC_ARG_ENABLE([checks-all],      AS_HELP_STRING([--enable-checks-all],      [enable all checks]))
 AC_ARG_ENABLE([checks-cppcheck], AS_HELP_STRING([--enable-checks-cppcheck], [enable cppcheck]))
-AC_ARG_ENABLE([checks-pthreads], AS_HELP_STRING([--enable-checks-pthreads], [enable tests that require pthreads]))
 AC_ARG_ENABLE([checks-python],   AS_HELP_STRING([--enable-checks-python],   [enable tests that require Python 3 with YAML and Jinja2]))
 AC_ARG_ENABLE([split-libc],      AS_HELP_STRING([--enable-split-libc],      [split off libc]))
 
@@ -96,7 +95,6 @@ AC_DEFUN([do_enable_checks_all],
 [
 if test -z "$enable_checks";          then enable_checks=yes;          fi
 if test -z "$enable_checks_cppcheck"; then enable_checks_cppcheck=yes; fi
-if test -z "$enable_checks_pthreads"; then enable_checks_pthreads=yes; fi
 if test -z "$enable_checks_python";   then enable_checks_python=yes;   fi
 ])
 AS_IF([test "$enable_checks_all" = yes], do_enable_checks_all)
@@ -145,7 +143,6 @@ AS_IF([test "$enable_freestanding"    = yes], [enable_freestanding=yes],    [ena
 AS_IF([test "$enable_checks"          = yes], [enable_checks=yes],          [enable_checks=no])
 AS_IF([test "$enable_checks_all"      = yes], [enable_checks_all=yes],      [enable_checks_all=no])
 AS_IF([test "$enable_checks_cppcheck" = yes], [enable_checks_cppcheck=yes], [enable_checks_cppcheck=no])
-AS_IF([test "$enable_checks_pthreads" = yes], [enable_checks_pthreads=yes], [enable_checks_pthreads=no])
 AS_IF([test "$enable_checks_python"   = yes], [enable_checks_python=yes],   [enable_checks_python=no])
 AS_IF([test "$enable_split_libc"      = yes], [enable_split_libc=yes],      [enable_split_libc=no])
 
@@ -211,7 +208,6 @@ dnl Features (disabled by default)
 AM_CONDITIONAL([ENABLE_FREESTANDING],    [test "$enable_freestanding"    = yes])
 AM_CONDITIONAL([ENABLE_CHECKS],          [test "$enable_checks"          = yes])
 AM_CONDITIONAL([ENABLE_CHECKS_CPPCHECK], [test "$enable_checks_cppcheck" = yes])
-AM_CONDITIONAL([ENABLE_CHECKS_PTHREADS], [test "$enable_checks_pthreads" = yes])
 AM_CONDITIONAL([ENABLE_CHECKS_PYTHON],   [test "$enable_checks_python"   = yes])
 AM_CONDITIONAL([ENABLE_SPLIT_LIBC],      [test "$enable_split_libc"      = yes])
 
@@ -265,7 +261,6 @@ dnl Features (disabled by default)
 AS_IF([test "$enable_freestanding"    = yes], [AC_DEFINE([ENABLE_FREESTANDING],    [1], [build for freestanding environment])])
 AS_IF([test "$enable_checks"          = yes], [AC_DEFINE([ENABLE_CHECKS],          [1], [enabled usual tests and examples])])
 AS_IF([test "$enable_checks_cppcheck" = yes], [AC_DEFINE([ENABLE_CHECKS_CPPCHECK], [1], [enabled cppcheck])])
-AS_IF([test "$enable_checks_pthreads" = yes], [AC_DEFINE([ENABLE_CHECKS_PTHREADS], [1], [enabled tests that require pthreads])])
 AS_IF([test "$enable_checks_python"   = yes], [AC_DEFINE([ENABLE_CHECKS_PYTHON],   [1], [enabled tests that require Python 3 with YAML and Jinja2])])
 AS_IF([test "$enable_split_libc"      = yes], [AC_DEFINE([ENABLE_SPLIT_LIBC],      [1], [split off libc])])
 
@@ -350,10 +345,6 @@ AS_IF([test "$enable_checks" = yes],
   [AC_CHECK_HEADERS([assert.h setjmp.h stdio.h stdlib.h string.h],,
     [AC_MSG_ERROR([the headers are required])])])
 
-AS_IF([test "$enable_checks" = yes -a "$enable_checks_pthreads" = yes],
-  [AC_CHECK_HEADERS([pthread.h],,
-    [AC_MSG_ERROR([the header is required])])])
-
 AM_PATH_PYTHON([3.8],, [:])
 AS_IF([test "$enable_checks_python" = yes -a "$enable_checks" = yes -a "$PYTHON" = ':'],
   [AC_MSG_ERROR([Python is required])])
diff --git a/examples/.gitignore b/examples/.gitignore
index fea0c55..091cc0a 100644
--- a/examples/.gitignore
+++ b/examples/.gitignore
@@ -1,7 +1,6 @@
 /cmdline
 /generic_display
 /generic_malloc
-/generic_mutex
 /macro_bits
 /macro_cast
 /macro_container_of
diff --git a/examples/Makefile.am b/examples/Makefile.am
index 76411d5..25f036b 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -29,16 +29,6 @@ TESTS += generic_malloc
 generic_malloc_LDADD = $(top_builddir)/libkernaux.la
 generic_malloc_SOURCES = main.c generic_malloc.c
 
-#################
-# generic_mutex #
-#################
-
-if ENABLE_CHECKS_PTHREADS
-TESTS += generic_mutex
-generic_mutex_LDADD = $(top_builddir)/libkernaux.la
-generic_mutex_SOURCES = main.c generic_mutex.c
-endif
-
 ##############
 # macro_bits #
 ##############
diff --git a/examples/generic_mutex.c b/examples/generic_mutex.c
deleted file mode 100644
index f728781..0000000
--- a/examples/generic_mutex.c
+++ /dev/null
@@ -1,79 +0,0 @@
-//============
-// my_mutex.c
-//============
-
-// To not always use macro "KERNAUX_PROTECTED_FIELD" around the names of
-// structure fields you may define "KERNAUX_ACCESS_PROTECTED" before including
-// any other headers, but ONLY in the file where you implement a generic type.
-//
-#define KERNAUX_ACCESS_PROTECTED
-
-//============
-// my_mutex.h
-//============
-
-#include <kernaux/generic/mutex.h>
-#include <pthread.h>
-
-typedef struct MyMutex {
-    struct KernAux_Mutex mutex;
-    pthread_mutex_t pthread_mutex;
-} *MyMutex;
-
-struct MyMutex MyMytex_create();
-
-//============
-// my_mutex.c
-//============
-
-#include <kernaux/generic/mutex.h>
-#include <pthread.h>
-#include <stdlib.h>
-
-static void MyMutex_lock  (void *mutex);
-static void MyMutex_unlock(void *mutex);
-
-struct MyMutex MyMutex_create()
-{
-    struct MyMutex my_mutex = {
-        .mutex = {
-            .lock   = MyMutex_lock,
-            .unlock = MyMutex_unlock,
-        },
-    };
-    if (pthread_mutex_init(&my_mutex.pthread_mutex, NULL) != 0) abort();
-    return my_mutex;
-}
-
-void MyMutex_lock(void *const mutex)
-{
-    const MyMutex my_mutex = mutex;
-    pthread_mutex_lock(&my_mutex->pthread_mutex);
-}
-
-void MyMutex_unlock(void *const mutex)
-{
-    const MyMutex my_mutex = mutex;
-    pthread_mutex_unlock(&my_mutex->pthread_mutex);
-}
-
-//========
-// main.c
-//========
-
-static int shared_counter = 0;
-
-void example_main()
-{
-    // Create mutex
-    struct MyMutex my_mutex = MyMutex_create();
-
-    // Lock mutex
-    KernAux_Mutex_lock(&my_mutex.mutex);
-
-    // Access shared data
-    ++shared_counter;
-
-    // Unlock mutex
-    KernAux_Mutex_unlock(&my_mutex.mutex);
-}