[Fact] // - too slow
public async Task global_session_locks()
{
var settings = new PostgresqlSettings();
using (var conn1 = new NpgsqlConnection(Servers.PostgresConnectionString))
using (var conn2 = new NpgsqlConnection(Servers.PostgresConnectionString))
using (var conn3 = new NpgsqlConnection(Servers.PostgresConnectionString))
{
await conn1.OpenAsync();
await conn2.OpenAsync();
await conn3.OpenAsync();
await settings.GetGlobalLock(conn1, 24);
try
{
// Cannot get the lock here
(await settings.TryGetGlobalLock(conn2, 24)).ShouldBeFalse();
// Can get the new lock
(await settings.TryGetGlobalLock(conn3, 25)).ShouldBeTrue();
// Cannot get the lock here
(await settings.TryGetGlobalLock(conn2, 25)).ShouldBeFalse();
}
finally
{
await settings.ReleaseGlobalLock(conn1, 24);
await settings.ReleaseGlobalLock(conn3, 25);
}
}
}
public async Task explicitly_release_global_session_locks()
{
var settings = new PostgresqlSettings();
using (var conn1 = new NpgsqlConnection(Servers.PostgresConnectionString))
using (var conn2 = new NpgsqlConnection(Servers.PostgresConnectionString))
using (var conn3 = new NpgsqlConnection(Servers.PostgresConnectionString))
{
await conn1.OpenAsync();
await conn2.OpenAsync();
await conn3.OpenAsync();
await settings.GetGlobalLock(conn1, 1);
// Cannot get the lock here
(await settings.TryGetGlobalLock(conn2, 1)).ShouldBeFalse();
await settings.ReleaseGlobalLock(conn1, 1);
for (var j = 0; j < 5; j++)
{
if (await settings.TryGetGlobalLock(conn2, 1))
{
return;
}
await Task.Delay(250);
}
throw new Exception("Advisory lock was not released");
}
}
