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#include "clar_libgit2.h"

#include "thread_helpers.h"

#ifdef GIT_THREADS

# if defined(GIT_WIN32)

# define git_thread_yield() Sleep(0)

# elif defined(__FreeBSD__) || defined(__MidnightBSD__) || defined(__DragonFly__)

# define git_thread_yield() pthread_yield()

# else

# define git_thread_yield() sched_yield()

# endif

#else

# define git_thread_yield() (void)0

#endif

static git_repository *_repo;

static git_tree *_a, *_b;

static git_atomic _counts[4];

static int _check_counts;

static int _retries;

#define THREADS 20

void test_threads_diff__initialize(void)

{

#ifdef GIT_WIN32

_retries = git_win32__retries;

git_win32__retries = 1;

#endif

}

void test_threads_diff__cleanup(void)

{

cl_git_sandbox_cleanup();

#ifdef GIT_WIN32

git_win32__retries = _retries;

#endif

}

static void setup_trees(void)

{

git_index *idx;

_repo = cl_git_sandbox_reopen(); /* reopen sandbox to flush caches */

/* avoid competing to load initial index */

cl_git_pass(git_repository_index(&idx, _repo));

git_index_free(idx);

cl_git_pass(git_revparse_single(

(git_object **)&_a, _repo, "0017bd4ab1^{tree}"));

cl_git_pass(git_revparse_single(

(git_object **)&_b, _repo, "26a125ee1b^{tree}"));

memset(_counts, 0, sizeof(_counts));

}

static void free_trees(void)

{

git_tree_free(_a); _a = NULL;

git_tree_free(_b); _b = NULL;

if (_check_counts) {

cl_assert_equal_i(288, git_atomic_get(&_counts[0]));

cl_assert_equal_i(112, git_atomic_get(&_counts[1]));

cl_assert_equal_i( 80, git_atomic_get(&_counts[2]));

cl_assert_equal_i( 96, git_atomic_get(&_counts[3]));

}

}

static void *run_index_diffs(void *arg)

{

int thread = *(int *)arg;

git_diff_options opts = GIT_DIFF_OPTIONS_INIT;

git_diff *diff = NULL;

size_t i;

int exp[4] = { 0, 0, 0, 0 };

switch (thread & 0x03) {

case 0: /* diff index to workdir */;

cl_git_pass(git_diff_index_to_workdir(&diff, _repo, NULL, &opts));

break;

case 1: /* diff tree 'a' to index */;

cl_git_pass(git_diff_tree_to_index(&diff, _repo, _a, NULL, &opts));

break;

case 2: /* diff tree 'b' to index */;

cl_git_pass(git_diff_tree_to_index(&diff, _repo, _b, NULL, &opts));

break;

case 3: /* diff index to workdir (explicit index) */;

{

git_index *idx;

cl_git_pass(git_repository_index(&idx, _repo));

cl_git_pass(git_diff_index_to_workdir(&diff, _repo, idx, &opts));

git_index_free(idx);

break;

}

}

/* keep some diff stats to make sure results are as expected */

i = git_diff_num_deltas(diff);

git_atomic_add(&_counts[0], (int32_t)i);

exp[0] = (int)i;

while (i > 0) {

switch (git_diff_get_delta(diff, --i)->status) {

case GIT_DELTA_MODIFIED: exp[1]++; git_atomic_inc(&_counts[1]); break;

case GIT_DELTA_ADDED: exp[2]++; git_atomic_inc(&_counts[2]); break;

case GIT_DELTA_DELETED: exp[3]++; git_atomic_inc(&_counts[3]); break;

default: break;

}

}

switch (thread & 0x03) {

case 0: case 3:

cl_assert_equal_i(8, exp[0]); cl_assert_equal_i(4, exp[1]);

cl_assert_equal_i(0, exp[2]); cl_assert_equal_i(4, exp[3]);

break;

case 1:

cl_assert_equal_i(12, exp[0]); cl_assert_equal_i(3, exp[1]);

cl_assert_equal_i(7, exp[2]); cl_assert_equal_i(2, exp[3]);

break;

case 2:

cl_assert_equal_i(8, exp[0]); cl_assert_equal_i(3, exp[1]);

cl_assert_equal_i(3, exp[2]); cl_assert_equal_i(2, exp[3]);

break;

}

git_diff_free(diff);

giterr_clear();

return arg;

}

void test_threads_diff__concurrent_diffs(void)

{

_repo = cl_git_sandbox_init("status");

_check_counts = 1;

run_in_parallel(

5, 32, run_index_diffs, setup_trees, free_trees);

}

static void *run_index_diffs_with_modifier(void *arg)

{

int thread = *(int *)arg;

git_diff_options opts = GIT_DIFF_OPTIONS_INIT;

git_diff *diff = NULL;

git_index *idx = NULL;

cl_git_pass(git_repository_index(&idx, _repo));

/* have first thread altering the index as we go */

if (thread == 0) {

int i;

for (i = 0; i < 300; ++i) {

switch (i & 0x03) {

case 0: (void)git_index_add_bypath(idx, "new_file"); break;

case 1: (void)git_index_remove_bypath(idx, "modified_file"); break;

case 2: (void)git_index_remove_bypath(idx, "new_file"); break;

case 3: (void)git_index_add_bypath(idx, "modified_file"); break;

}

git_thread_yield();

}

goto done;

}

/* only use explicit index in this test to prevent reloading */

switch (thread & 0x03) {

case 0: /* diff index to workdir */;

cl_git_pass(git_diff_index_to_workdir(&diff, _repo, idx, &opts));

break;

case 1: /* diff tree 'a' to index */;

cl_git_pass(git_diff_tree_to_index(&diff, _repo, _a, idx, &opts));

break;

case 2: /* diff tree 'b' to index */;

cl_git_pass(git_diff_tree_to_index(&diff, _repo, _b, idx, &opts));

break;

case 3: /* diff index to workdir reversed */;

opts.flags |= GIT_DIFF_REVERSE;

cl_git_pass(git_diff_index_to_workdir(&diff, _repo, idx, &opts));

break;

}

/* results will be unpredictable with index modifier thread running */

git_diff_free(diff);

done:

git_index_free(idx);

giterr_clear();

return arg;

}

void test_threads_diff__with_concurrent_index_modified(void)

{

_repo = cl_git_sandbox_init("status");

_check_counts = 0;

run_in_parallel(

5, 16, run_index_diffs_with_modifier, setup_trees, free_trees);

}